81877092 has 96 divisors (see below), whose sum is σ = 219300480. Its totient is φ = 23546880.

The previous prime is 81877087. The next prime is 81877127. The reversal of 81877092 is 29077818.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279298 + ... + 279590.

It is an arithmetic number, because the mean of its divisors is an integer number (2284380).

Almost surely, 2^81877092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81877092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109650240).

81877092 is an abundant number, since it is smaller than the sum of its proper divisors (137423388).

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

81877092 is a wasteful number, since it uses less digits than its factorization.

81877092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 81877092 is about 9048.5961342078. The cubic root of 81877092 is about 434.2309784391.

The spelling of 81877092 in words is "eighty-one million, eight hundred seventy-seven thousand, ninety-two".