3897581264 has 30 divisors (see below), whose sum is σ = 7969944690. Its totient is φ = 1846219968.

The previous prime is 3897581249. The next prime is 3897581269. The reversal of 3897581264 is 4621857983.

It can be written as a sum of positive squares in only one way, i.e., 3559315600 + 338265664 = 59660^2 + 18392^2 .

It is a super-2 number, since 2×3897581264² = 30382279418967675392, which contains 22 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3897581269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 331619 + ... + 343170.

It is an arithmetic number, because the mean of its divisors is an integer number (265664823).

Almost surely, 2^3897581264 is an apocalyptic number.

It is an amenable number.

3897581264 is an abundant number, since it is smaller than the sum of its proper divisors (4072363426).

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

3897581264 is a wasteful number, since it uses less digits than its factorization.

3897581264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674835 (or 674810 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The square root of 3897581264 is about 62430.6115939929. The cubic root of 3897581264 is about 1573.7354443968.

The spelling of 3897581264 in words is "three billion, eight hundred ninety-seven million, five hundred eighty-one thousand, two hundred sixty-four".