81472592 has 20 divisors (see below), whose sum is σ = 158489856. Its totient is φ = 40572000.

The previous prime is 81472561. The next prime is 81472597. The reversal of 81472592 is 29527418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81472597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6128 + ... + 14159.

Almost surely, 2^81472592 is an apocalyptic number.

It is an amenable number.

81472592 is a deficient number, since it is larger than the sum of its proper divisors (77017264).

81472592 is a wasteful number, since it uses less digits than its factorization.

81472592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20546 (or 20540 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 81472592 is about 9026.2169262654. The cubic root of 81472592 is about 433.5147159146.

The spelling of 81472592 in words is "eighty-one million, four hundred seventy-two thousand, five hundred ninety-two".