64769479640 has 32 divisors (see below), whose sum is σ = 145822498560. Its totient is φ = 25891584000.

The previous prime is 64769479637. The next prime is 64769479651. The reversal of 64769479640 is 4697496746.

It is a congruent number.

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, 441656 + ... + 569735.

It is an arithmetic number, because the mean of its divisors is an integer number (4556953080).

Almost surely, 2^64769479640 is an apocalyptic number.

It is an amenable number.

64769479640 is an abundant number, since it is smaller than the sum of its proper divisors (81053018920).

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

64769479640 is a wasteful number, since it uses less digits than its factorization.

64769479640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013003 (or 1012999 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 62.

The spelling of 64769479640 in words is "sixty-four billion, seven hundred sixty-nine million, four hundred seventy-nine thousand, six hundred forty".