81575376 has 40 divisors (see below), whose sum is σ = 218006880. Its totient is φ = 26253696.

The previous prime is 81575371. The next prime is 81575387. The reversal of 81575376 is 67357518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81575371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27910 + ... + 30693.

It is an arithmetic number, because the mean of its divisors is an integer number (5450172).

Almost surely, 2^81575376 is an apocalyptic number.

It is an amenable number.

81575376 is an abundant number, since it is smaller than the sum of its proper divisors (136431504).

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

81575376 is a wasteful number, since it uses less digits than its factorization.

81575376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58643 (or 58637 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 81575376 is about 9031.9087683612. The cubic root of 81575376 is about 433.6969434615.

The spelling of 81575376 in words is "eighty-one million, five hundred seventy-five thousand, three hundred seventy-six".