81082077 has 8 divisors (see below), whose sum is σ = 108462816. Its totient is φ = 53878032.

The previous prime is 81082073. The next prime is 81082087. The reversal of 81082077 is 77028018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81082077 - 2² = 81082073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81082073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43098 + ... + 44939.

It is an arithmetic number, because the mean of its divisors is an integer number (13557852).

Almost surely, 2^81082077 is an apocalyptic number.

It is an amenable number.

81082077 is a deficient number, since it is larger than the sum of its proper divisors (27380739).

81082077 is a wasteful number, since it uses less digits than its factorization.

81082077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88347.

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 81082077 is about 9004.5586788026. The cubic root of 81082077 is about 432.8209643729.

The spelling of 81082077 in words is "eighty-one million, eighty-two thousand, seventy-seven".