1564792440 has 64 divisors (see below), whose sum is σ = 4856263200. Its totient is φ = 402888192.

The previous prime is 1564792433. The next prime is 1564792447. The reversal of 1564792440 is 442974651.

It is an interprime number because it is at equal distance from previous prime (1564792433) and next prime (1564792447).

It is a junction number, because it is equal to n+sod(n) for n = 1564792392 and 1564792401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1564792447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221347 + ... + 228306.

Almost surely, 2^1564792440 is an apocalyptic number.

1564792440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1564792440 is an abundant number, since it is smaller than the sum of its proper divisors (3291470760).

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

1564792440 is a wasteful number, since it uses less digits than its factorization.

1564792440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449696 (or 449692 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 1564792440 is about 39557.4574511558. The cubic root of 1564792440 is about 1160.9644278344.

The spelling of 1564792440 in words is "one billion, five hundred sixty-four million, seven hundred ninety-two thousand, four hundred forty".