81677380 has 24 divisors (see below), whose sum is σ = 173130048. Its totient is φ = 32364768.

The previous prime is 81677377. The next prime is 81677411. The reversal of 81677380 is 8377618.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16944 + ... + 21223.

It is an arithmetic number, because the mean of its divisors is an integer number (7213752).

Almost surely, 2^81677380 is an apocalyptic number.

It is an amenable number.

81677380 is an abundant number, since it is smaller than the sum of its proper divisors (91452668).

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

81677380 is a wasteful number, since it uses less digits than its factorization.

81677380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38283 (or 38281 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 81677380 is about 9037.5538725919. The cubic root of 81677380 is about 433.8776368638.

The spelling of 81677380 in words is "eighty-one million, six hundred seventy-seven thousand, three hundred eighty".