81791832 has 32 divisors (see below), whose sum is σ = 211532400. Its totient is φ = 26323584.

The previous prime is 81791807. The next prime is 81791833. The reversal of 81791832 is 23819718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81791833) 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, 58063 + ... + 59454.

Almost surely, 2^81791832 is an apocalyptic number.

It is an amenable number.

81791832 is an abundant number, since it is smaller than the sum of its proper divisors (129740568).

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

81791832 is a wasteful number, since it uses less digits than its factorization.

81791832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117555 (or 117551 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 81791832 is about 9043.8836790397. The cubic root of 81791832 is about 434.0802020722.

It can be divided in two parts, 8179 and 1832, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 81791832 in words is "eighty-one million, seven hundred ninety-one thousand, eight hundred thirty-two".