81725392 has 40 divisors (see below), whose sum is σ = 191612736. Its totient is φ = 32964096.

The previous prime is 81725387. The next prime is 81725411. The reversal of 81725392 is 29352718.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19558 + ... + 23365.

Almost surely, 2^81725392 is an apocalyptic number.

It is an amenable number.

81725392 is an abundant number, since it is smaller than the sum of its proper divisors (109887344).

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

81725392 is a wasteful number, since it uses less digits than its factorization.

81725392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42955 (or 42949 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 81725392 is about 9040.2097320803. The cubic root of 81725392 is about 433.9626349081.

The spelling of 81725392 in words is "eighty-one million, seven hundred twenty-five thousand, three hundred ninety-two".