81296310 has 16 divisors (see below), whose sum is σ = 195111216. Its totient is φ = 21679008.

The previous prime is 81296287. The next prime is 81296321. The reversal of 81296310 is 1369218.

It is a super-2 number, since 2×81296310² = 13218180039232200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2709877 = 81296310 / (8 + 1 + 2 + 9 + 6 + 3 + 1 + 0).

It is a Curzon number.

It is a congruent number.

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, 1354909 + ... + 1354968.

It is an arithmetic number, because the mean of its divisors is an integer number (12194451).

Almost surely, 2^81296310 is an apocalyptic number.

81296310 is an abundant number, since it is smaller than the sum of its proper divisors (113814906).

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

81296310 is a wasteful number, since it uses less digits than its factorization.

81296310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2709887.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 81296310 is about 9016.4466393364. The cubic root of 81296310 is about 433.2018253142.

The spelling of 81296310 in words is "eighty-one million, two hundred ninety-six thousand, three hundred ten".