64678978380 has 24 divisors (see below), whose sum is σ = 181101139632. Its totient is φ = 17247727552.

The previous prime is 64678978373. The next prime is 64678978391. The reversal of 64678978380 is 8387987646.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 538991427 + ... + 538991546.

It is an arithmetic number, because the mean of its divisors is an integer number (7545880818).

Almost surely, 2^64678978380 is an apocalyptic number.

64678978380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64678978380 is an abundant number, since it is smaller than the sum of its proper divisors (116422161252).

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

64678978380 is a wasteful number, since it uses less digits than its factorization.

64678978380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077982985 (or 1077982983 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 66.

The spelling of 64678978380 in words is "sixty-four billion, six hundred seventy-eight million, nine hundred seventy-eight thousand, three hundred eighty".