1564735812 has 12 divisors (see below), whose sum is σ = 3651050256. Its totient is φ = 521578600.

The previous prime is 1564735771. The next prime is 1564735813. The reversal of 1564735812 is 2185374651.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1564735812² = 4896796322710598688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1564735813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65197314 + ... + 65197337.

It is an arithmetic number, because the mean of its divisors is an integer number (304254188).

Almost surely, 2^1564735812 is an apocalyptic number.

1564735812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1564735812 is an abundant number, since it is smaller than the sum of its proper divisors (2086314444).

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

1564735812 is a wasteful number, since it uses less digits than its factorization.

1564735812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130394658 (or 130394656 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 1564735812 is about 39556.7416757245. The cubic root of 1564735812 is about 1160.9504230192.

The spelling of 1564735812 in words is "one billion, five hundred sixty-four million, seven hundred thirty-five thousand, eight hundred twelve".