81038475 has 60 divisors (see below), whose sum is σ = 171585744. Its totient is φ = 37039680.

The previous prime is 81038471. The next prime is 81038479. The reversal of 81038475 is 57483018.

It is an interprime number because it is at equal distance from previous prime (81038471) and next prime (81038479).

It is not a de Polignac number, because 81038475 - 2² = 81038471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81038471) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 11317 + ... + 17033.

Almost surely, 2^81038475 is an apocalyptic number.

81038475 is an abundant number, since it is smaller than the sum of its proper divisors (90547269).

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

81038475 is a wasteful number, since it uses less digits than its factorization.

81038475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5746 (or 5732 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 81038475 is about 9002.1372462321. The cubic root of 81038475 is about 432.7433671028.

The spelling of 81038475 in words is "eighty-one million, thirty-eight thousand, four hundred seventy-five".