81072072367 has 48 divisors (see below), whose sum is σ = 98796319776. Its totient is φ = 66035692800.

The previous prime is 81072072359. The next prime is 81072072373. The reversal of 81072072367 is 76327027018.

It is not a de Polignac number, because 81072072367 - 2³ = 81072072359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81072072317) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28575273 + ... + 28578109.

It is an arithmetic number, because the mean of its divisors is an integer number (2058256662).

Almost surely, 2^81072072367 is an apocalyptic number.

81072072367 is a deficient number, since it is larger than the sum of its proper divisors (17724247409).

81072072367 is a wasteful number, since it uses less digits than its factorization.

81072072367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400 (or 3389 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 81072072367 in words is "eighty-one billion, seventy-two million, seventy-two thousand, three hundred sixty-seven".