64732908240 has 1920 divisors, whose sum is σ = 313694208000. Its totient is φ = 12152125440.

The previous prime is 64732908223. The next prime is 64732908263. The reversal of 64732908240 is 4280923746.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1377295897 + ... + 1377295943.

It is an arithmetic number, because the mean of its divisors is an integer number (163382400).

Almost surely, 2^64732908240 is an apocalyptic number.

64732908240 is a gapful number since it is divisible by the number (60) 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 64732908240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156847104000).

64732908240 is an abundant number, since it is smaller than the sum of its proper divisors (248961299760).

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

64732908240 is a wasteful number, since it uses less digits than its factorization.

64732908240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 64732908240 in words is "sixty-four billion, seven hundred thirty-two million, nine hundred eight thousand, two hundred forty".