81457552 has 20 divisors (see below), whose sum is σ = 172172016. Its totient is φ = 37026080.

The previous prime is 81457547. The next prime is 81457567. The reversal of 81457552 is 25575418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231238 + ... + 231589.

Almost surely, 2^81457552 is an apocalyptic number.

It is an amenable number.

81457552 is an abundant number, since it is smaller than the sum of its proper divisors (90714464).

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

81457552 is a wasteful number, since it uses less digits than its factorization.

81457552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462846 (or 462840 counting only the distinct ones).

The product of its digits is 56000, while the sum is 37.

The square root of 81457552 is about 9025.3837591540. The cubic root of 81457552 is about 433.4880383845.

The spelling of 81457552 in words is "eighty-one million, four hundred fifty-seven thousand, five hundred fifty-two".