1644654480 has 160 divisors (see below), whose sum is σ = 5839935744. Its totient is φ = 375072768.

The previous prime is 1644654419. The next prime is 1644654493. The reversal of 1644654480 is 844564461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1029042 + ... + 1030638.

Almost surely, 2^1644654480 is an apocalyptic number.

1644654480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644654480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2919967872).

1644654480 is an abundant number, since it is smaller than the sum of its proper divisors (4195281264).

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

1644654480 is a wasteful number, since it uses less digits than its factorization.

1644654480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233 (or 2227 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 42.

The square root of 1644654480 is about 40554.3398417481. The cubic root of 1644654480 is about 1180.3882855097.

The spelling of 1644654480 in words is "one billion, six hundred forty-four million, six hundred fifty-four thousand, four hundred eighty".