64891862729620 has 48 divisors (see below), whose sum is σ = 145612717422480. Its totient is φ = 24205750401024.

The previous prime is 64891862729591. The next prime is 64891862729651. The reversal of 64891862729620 is 2692726819846.

64891862729620 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 12489523538704 + 52402339190916 = 3534052^2 + 7238946^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64891862729620.

It is a congruent number.

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, 875460279 + ... + 875534398.

It is an arithmetic number, because the mean of its divisors is an integer number (3033598279635).

Almost surely, 2^{64891862729620} is an apocalyptic number.

It is an amenable number.

64891862729620 is an abundant number, since it is smaller than the sum of its proper divisors (80720854692860).

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

64891862729620 is a wasteful number, since it uses less digits than its factorization.

64891862729620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750994812 (or 1750994810 counting only the distinct ones).

The product of its (nonzero) digits is 250822656, while the sum is 70.

The spelling of 64891862729620 in words is "sixty-four trillion, eight hundred ninety-one billion, eight hundred sixty-two million, seven hundred twenty-nine thousand, six hundred twenty".