84531721764 has 48 divisors (see below), whose sum is σ = 225486829568. Its totient is φ = 24144537888.

The previous prime is 84531721759. The next prime is 84531721783. The reversal of 84531721764 is 46712713548.

It is a super-2 number, since 2×84531721764² (a number of 23 digits) contains 22 as substring.

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, 125637 + ... + 429939.

Almost surely, 2^84531721764 is an apocalyptic number.

84531721764 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

84531721764 is an abundant number, since it is smaller than the sum of its proper divisors (140955107804).

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

84531721764 is a wasteful number, since it uses less digits than its factorization.

84531721764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307624 (or 307622 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 48.

The spelling of 84531721764 in words is "eighty-four billion, five hundred thirty-one million, seven hundred twenty-one thousand, seven hundred sixty-four".