81318024 has 48 divisors (see below), whose sum is σ = 231831600. Its totient is φ = 25678944.

The previous prime is 81318023. The next prime is 81318067. The reversal of 81318024 is 42081318.

It is a super-2 number, since 2×81318024² = 13225242054529152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81318023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28354 + ... + 31089.

It is an arithmetic number, because the mean of its divisors is an integer number (4829825).

Almost surely, 2^81318024 is an apocalyptic number.

It is an amenable number.

81318024 is an abundant number, since it is smaller than the sum of its proper divisors (150513576).

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

81318024 is a wasteful number, since it uses less digits than its factorization.

81318024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59474 (or 59467 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81318024 is about 9017.6506918376. The cubic root of 81318024 is about 433.2403908493.

The spelling of 81318024 in words is "eighty-one million, three hundred eighteen thousand, twenty-four".