81387032 has 32 divisors (see below), whose sum is σ = 161295600. Its totient is φ = 38392704.

The previous prime is 81386999. The next prime is 81387049. The reversal of 81387032 is 23078318.

It is a self number, because there is not a number n which added to its sum of digits gives 81387032.

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, 41138 + ... + 43070.

Almost surely, 2^81387032 is an apocalyptic number.

It is an amenable number.

81387032 is a deficient number, since it is larger than the sum of its proper divisors (79908568).

81387032 is a wasteful number, since it uses less digits than its factorization.

81387032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235 (or 2231 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 81387032 is about 9021.4761541557. The cubic root of 81387032 is about 433.3629081721.

The spelling of 81387032 in words is "eighty-one million, three hundred eighty-seven thousand, thirty-two".