81539890302 has 48 divisors (see below), whose sum is σ = 182285849088. Its totient is φ = 24279858720.

The previous prime is 81539890279. The next prime is 81539890319. The reversal of 81539890302 is 20309893518.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1265568 + ... + 1328435.

It is an arithmetic number, because the mean of its divisors is an integer number (3797621856).

Almost surely, 2^81539890302 is an apocalyptic number.

81539890302 is an abundant number, since it is smaller than the sum of its proper divisors (100745958786).

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

81539890302 is a wasteful number, since it uses less digits than its factorization.

81539890302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594065 (or 2594052 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 81539890302 in words is "eighty-one billion, five hundred thirty-nine million, eight hundred ninety thousand, three hundred two".