81862392 has 16 divisors (see below), whose sum is σ = 204656040. Its totient is φ = 27287456.

The previous prime is 81862367. The next prime is 81862399. The reversal of 81862392 is 29326818.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81862392.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81862399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1705443 + ... + 1705490.

Almost surely, 2^81862392 is an apocalyptic number.

It is an amenable number.

81862392 is an abundant number, since it is smaller than the sum of its proper divisors (122793648).

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

81862392 is a wasteful number, since it uses less digits than its factorization.

81862392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410942 (or 3410938 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 81862392 is about 9047.7838170460. The cubic root of 81862392 is about 434.2049899838.

The spelling of 81862392 in words is "eighty-one million, eight hundred sixty-two thousand, three hundred ninety-two".