81892368 has 60 divisors (see below), whose sum is σ = 229821228. Its totient is φ = 27221760.

The previous prime is 81892331. The next prime is 81892373. The reversal of 81892368 is 86329818.

It can be written as a sum of positive squares in 2 ways, for example, as 24920064 + 56972304 = 4992^2 + 7548^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79698 + ... + 80718.

Almost surely, 2^81892368 is an apocalyptic number.

It is an amenable number.

81892368 is an abundant number, since it is smaller than the sum of its proper divisors (147928860).

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

81892368 is a wasteful number, since it uses less digits than its factorization.

81892368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592 (or 1583 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 81892368 is about 9049.4402036811. The cubic root of 81892368 is about 434.2579819219.

The spelling of 81892368 in words is "eighty-one million, eight hundred ninety-two thousand, three hundred sixty-eight".