81293370 has 32 divisors (see below), whose sum is σ = 197579520. Its totient is φ = 21403200.

The previous prime is 81293369. The next prime is 81293383. The reversal of 81293370 is 7339218.

It is a super-2 number, since 2×81293370² = 13217224011913800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14781 + ... + 19520.

It is an arithmetic number, because the mean of its divisors is an integer number (6174360).

Almost surely, 2^81293370 is an apocalyptic number.

81293370 is an abundant number, since it is smaller than the sum of its proper divisors (116286150).

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

81293370 is a wasteful number, since it uses less digits than its factorization.

81293370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34390.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 81293370 is about 9016.2836024606. The cubic root of 81293370 is about 433.1966031472.

The spelling of 81293370 in words is "eighty-one million, two hundred ninety-three thousand, three hundred seventy".