64987856880 has 320 divisors, whose sum is σ = 224265646080. Its totient is φ = 15499468800.

The previous prime is 64987856809. The next prime is 64987856891. The reversal of 64987856880 is 8865878946.

It is a congruent number.

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, 5790154 + ... + 5801366.

It is an arithmetic number, because the mean of its divisors is an integer number (700830144).

Almost surely, 2^64987856880 is an apocalyptic number.

64987856880 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 64987856880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112132823040).

64987856880 is an abundant number, since it is smaller than the sum of its proper divisors (159277789200).

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

64987856880 is a wasteful number, since it uses less digits than its factorization.

64987856880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11320 (or 11314 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 69.

The spelling of 64987856880 in words is "sixty-four billion, nine hundred eighty-seven million, eight hundred fifty-six thousand, eight hundred eighty".