81574944 has 48 divisors (see below), whose sum is σ = 233604000. Its totient is φ = 24719360.

The previous prime is 81574943. The next prime is 81575051. The reversal of 81574944 is 44947518.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 81574896 and 81574905.

It is not an unprimeable number, because it can be changed into a prime (81574943) 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, 37569 + ... + 39680.

It is an arithmetic number, because the mean of its divisors is an integer number (4866750).

Almost surely, 2^81574944 is an apocalyptic number.

It is an amenable number.

81574944 is an abundant number, since it is smaller than the sum of its proper divisors (152029056).

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

81574944 is a wasteful number, since it uses less digits than its factorization.

81574944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77273 (or 77265 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 81574944 is about 9031.8848531190. The cubic root of 81574944 is about 433.6961778816.

The spelling of 81574944 in words is "eighty-one million, five hundred seventy-four thousand, nine hundred forty-four".