81776304 has 180 divisors, whose sum is σ = 256259640. Its totient is φ = 25194240.

The previous prime is 81776281. The next prime is 81776311. The reversal of 81776304 is 40367718.

81776304 is a `hidden beast` number, since 8 + 17 + 7 + 630 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1994524 + ... + 1994564.

Almost surely, 2^81776304 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 81776304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128129820).

81776304 is an abundant number, since it is smaller than the sum of its proper divisors (174483336).

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

81776304 is an equidigital number, since it uses as much as digits as its factorization.

81776304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 81776304 is about 9043.0251575455. The cubic root of 81776304 is about 434.0527306087.

The spelling of 81776304 in words is "eighty-one million, seven hundred seventy-six thousand, three hundred four".