81962392 has 8 divisors (see below), whose sum is σ = 153679500. Its totient is φ = 40981192.

The previous prime is 81962369. The next prime is 81962393. The reversal of 81962392 is 29326918.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81962393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5122642 + ... + 5122657.

Almost surely, 2^81962392 is an apocalyptic number.

It is an amenable number.

81962392 is a deficient number, since it is larger than the sum of its proper divisors (71717108).

81962392 is a wasteful number, since it uses less digits than its factorization.

81962392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10245305 (or 10245301 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 81962392 is about 9053.3083455718. The cubic root of 81962392 is about 434.3817208352.

The spelling of 81962392 in words is "eighty-one million, nine hundred sixty-two thousand, three hundred ninety-two".