64738745344 has 352 divisors, whose sum is σ = 167212322816. Its totient is φ = 24365629440.

The previous prime is 64738745329. The next prime is 64738745387. The reversal of 64738745344 is 44354783746.

It is a super-2 number, since 2×64738745344² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210875239 + ... + 210875545.

It is an arithmetic number, because the mean of its divisors is an integer number (475035008).

Almost surely, 2^64738745344 is an apocalyptic number.

64738745344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64738745344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83606161408).

64738745344 is an abundant number, since it is smaller than the sum of its proper divisors (102473577472).

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

64738745344 is a wasteful number, since it uses less digits than its factorization.

64738745344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 433 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 55.

The spelling of 64738745344 in words is "sixty-four billion, seven hundred thirty-eight million, seven hundred forty-five thousand, three hundred forty-four".