3856821264 has 80 divisors (see below), whose sum is σ = 11222248000. Its totient is φ = 1267985664.

The previous prime is 3856821257. The next prime is 3856821277. The reversal of 3856821264 is 4621286583.

3856821264 is a `hidden beast` number, since 3 + 8 + 568 + 21 + 2 + 64 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29614 + ... + 92685.

It is an arithmetic number, because the mean of its divisors is an integer number (140278100).

Almost surely, 2^3856821264 is an apocalyptic number.

It is an amenable number.

3856821264 is an abundant number, since it is smaller than the sum of its proper divisors (7365426736).

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

3856821264 is a wasteful number, since it uses less digits than its factorization.

3856821264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122389 (or 122377 counting only the distinct ones).

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

The square root of 3856821264 is about 62103.3112160696. The cubic root of 3856821264 is about 1568.2302890452.

The spelling of 3856821264 in words is "three billion, eight hundred fifty-six million, eight hundred twenty-one thousand, two hundred sixty-four".