81232362990 has 48 divisors (see below), whose sum is σ = 216912372768. Its totient is φ = 21076504128.

The previous prime is 81232362979. The next prime is 81232363031. The reversal of 81232362990 is 9926323218.

It is a happy number.

81232362990 is a `hidden beast` number, since 8 + 12 + 3 + 2 + 3 + 629 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 12193722 + ... + 12200381.

It is an arithmetic number, because the mean of its divisors is an integer number (4519007766).

Almost surely, 2^81232362990 is an apocalyptic number.

81232362990 is an abundant number, since it is smaller than the sum of its proper divisors (135680009778).

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

81232362990 is a wasteful number, since it uses less digits than its factorization.

81232362990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24394153 (or 24394150 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 81232362990 in words is "eighty-one billion, two hundred thirty-two million, three hundred sixty-two thousand, nine hundred ninety".