81892707 has 16 divisors (see below), whose sum is σ = 117821088. Its totient is φ = 50296320.

The previous prime is 81892691. The next prime is 81892721. The reversal of 81892707 is 70729818.

It is not a de Polignac number, because 81892707 - 2⁴ = 81892691 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81892777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21357 + ... + 24897.

It is an arithmetic number, because the mean of its divisors is an integer number (7363818).

Almost surely, 2^81892707 is an apocalyptic number.

81892707 is a deficient number, since it is larger than the sum of its proper divisors (35928381).

81892707 is a wasteful number, since it uses less digits than its factorization.

81892707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 81892707 is about 9049.4589341021. The cubic root of 81892707 is about 434.2585811363.

The spelling of 81892707 in words is "eighty-one million, eight hundred ninety-two thousand, seven hundred seven".