64874922640 has 320 divisors, whose sum is σ = 182971146240. Its totient is φ = 21113856000.

The previous prime is 64874922631. The next prime is 64874922661. The reversal of 64874922640 is 4622947846.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27360655 + ... + 27363025.

It is an arithmetic number, because the mean of its divisors is an integer number (571784832).

Almost surely, 2^64874922640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64874922640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91485573120).

64874922640 is an abundant number, since it is smaller than the sum of its proper divisors (118096223600).

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

64874922640 is a wasteful number, since it uses less digits than its factorization.

64874922640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502 (or 2496 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 64874922640 in words is "sixty-four billion, eight hundred seventy-four million, nine hundred twenty-two thousand, six hundred forty".