64539000780 has 48 divisors (see below), whose sum is σ = 180720336384. Its totient is φ = 17209339840.

The previous prime is 64539000769. The next prime is 64539000793. The reversal of 64539000780 is 8700093546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1685245 + ... + 1723115.

It is an arithmetic number, because the mean of its divisors is an integer number (3765007008).

Almost surely, 2^64539000780 is an apocalyptic number.

64539000780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64539000780 is an abundant number, since it is smaller than the sum of its proper divisors (116181335604).

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

64539000780 is a wasteful number, since it uses less digits than its factorization.

64539000780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66286 (or 66284 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 64539000780 in words is "sixty-four billion, five hundred thirty-nine million, seven hundred eighty", and thus it is an aban number.