81776454 has 32 divisors (see below), whose sum is σ = 174645504. Its totient is φ = 25465440.

The previous prime is 81776447. The next prime is 81776483. The reversal of 81776454 is 45467718.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 957 + ... + 12824.

It is an arithmetic number, because the mean of its divisors is an integer number (5457672).

Almost surely, 2^81776454 is an apocalyptic number.

81776454 is an abundant number, since it is smaller than the sum of its proper divisors (92869050).

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

81776454 is a wasteful number, since it uses less digits than its factorization.

81776454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13852.

The product of its digits is 188160, while the sum is 42.

The square root of 81776454 is about 9043.0334512264. The cubic root of 81776454 is about 434.0529959989.

The spelling of 81776454 in words is "eighty-one million, seven hundred seventy-six thousand, four hundred fifty-four".