64387002856 has 32 divisors (see below), whose sum is σ = 138632306400. Its totient is φ = 27726459840.

The previous prime is 64387002809. The next prime is 64387002871. The reversal of 64387002856 is 65820078346.

It is a super-2 number, since 2×64387002856² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19252815 + ... + 19256158.

It is an arithmetic number, because the mean of its divisors is an integer number (4332259575).

Almost surely, 2^64387002856 is an apocalyptic number.

It is an amenable number.

64387002856 is an abundant number, since it is smaller than the sum of its proper divisors (74245303544).

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

64387002856 is a wasteful number, since it uses less digits than its factorization.

64387002856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38509009 (or 38509005 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 64387002856 in words is "sixty-four billion, three hundred eighty-seven million, two thousand, eight hundred fifty-six".