81028081590 has 32 divisors (see below), whose sum is σ = 194605515360. Its totient is φ = 21592141824.

The previous prime is 81028081583. The next prime is 81028081681. The reversal of 81028081590 is 9518082018.

It is a congruent 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, 916189 + ... + 1000728.

It is an arithmetic number, because the mean of its divisors is an integer number (6081422355).

Almost surely, 2^81028081590 is an apocalyptic number.

81028081590 is an abundant number, since it is smaller than the sum of its proper divisors (113577433770).

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

81028081590 is a wasteful number, since it uses less digits than its factorization.

81028081590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918336.

The product of its (nonzero) digits is 46080, while the sum is 42.

The spelling of 81028081590 in words is "eighty-one billion, twenty-eight million, eighty-one thousand, five hundred ninety".