1988446464 has 81 divisors (see below), whose sum is σ = 5739359353. Its totient is φ = 662102016.

The previous prime is 1988446417. The next prime is 1988446469. The reversal of 1988446464 is 4646448891.

The square root of 1988446464 is 44592.

It is a perfect power (a square), and thus also a powerful number.

1988446464 is a `hidden beast` number, since 198 + 8 + 446 + 4 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38340864 + 1950105600 = 6192^2 + 44160^2 .

It is a super-3 number, since 3×1988446464³ (a number of 29 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1988446464.

It is not an unprimeable number, because it can be changed into a prime (1988446469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2139952 + ... + 2140880.

Almost surely, 2^1988446464 is an apocalyptic number.

1988446464 is the 44592-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1988446464

1988446464 is an abundant number, since it is smaller than the sum of its proper divisors (3750912889).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1988446464 is an frugal number, since it uses more digits than its factorization.

1988446464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880 (or 934 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 54.

The cubic root of 1988446464 is about 1257.4902726555.

The spelling of 1988446464 in words is "one billion, nine hundred eighty-eight million, four hundred forty-six thousand, four hundred sixty-four".