64887677640 has 256 divisors, whose sum is σ = 219820089600. Its totient is φ = 17235659520.

The previous prime is 64887677639. The next prime is 64887677641. The reversal of 64887677640 is 4677678846.

It is an interprime number because it is at equal distance from previous prime (64887677639) and next prime (64887677641).

It is not an unprimeable number, because it can be changed into a prime (64887677641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24755530 + ... + 24758150.

It is an arithmetic number, because the mean of its divisors is an integer number (858672225).

Almost surely, 2^64887677640 is an apocalyptic number.

64887677640 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 64887677640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109910044800).

64887677640 is an abundant number, since it is smaller than the sum of its proper divisors (154932411960).

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

64887677640 is a wasteful number, since it uses less digits than its factorization.

64887677640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936 (or 2914 counting only the distinct ones).

The product of its (nonzero) digits is 75866112, while the sum is 63.

The spelling of 64887677640 in words is "sixty-four billion, eight hundred eighty-seven million, six hundred seventy-seven thousand, six hundred forty".