1564481646 has 96 divisors (see below), whose sum is σ = 4181399040. Its totient is φ = 411676992.

The previous prime is 1564481629. The next prime is 1564481651. The reversal of 1564481646 is 6461844651.

1564481646 is a `hidden beast` number, since 1 + 564 + 4 + 81 + 6 + 4 + 6 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1013151 + ... + 1014693.

It is an arithmetic number, because the mean of its divisors is an integer number (43556240).

Almost surely, 2^1564481646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1564481646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2090699520).

1564481646 is an abundant number, since it is smaller than the sum of its proper divisors (2616917394).

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

1564481646 is a wasteful number, since it uses less digits than its factorization.

1564481646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 2187 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 1564481646 is about 39553.5288691161. The cubic root of 1564481646 is about 1160.8875604151.

The spelling of 1564481646 in words is "one billion, five hundred sixty-four million, four hundred eighty-one thousand, six hundred forty-six".