81318032 has 10 divisors (see below), whose sum is σ = 157553718. Its totient is φ = 40659008.

The previous prime is 81318023. The next prime is 81318067. The reversal of 81318032 is 23081318.

It can be written as a sum of positive squares in only one way, i.e., 81072016 + 246016 = 9004^2 + 496^2 .

It is a super-2 number, since 2×81318032² = 13225244656706048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81317992 and 81318010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2541173 + ... + 2541204.

Almost surely, 2^81318032 is an apocalyptic number.

It is an amenable number.

81318032 is a deficient number, since it is larger than the sum of its proper divisors (76235686).

81318032 is a wasteful number, since it uses less digits than its factorization.

81318032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5082385 (or 5082379 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81318032 is about 9017.6511354121. The cubic root of 81318032 is about 433.2404050565.

The spelling of 81318032 in words is "eighty-one million, three hundred eighteen thousand, thirty-two".