81423307 has 8 divisors (see below), whose sum is σ = 93139200. Its totient is φ = 69728424.

The previous prime is 81423301. The next prime is 81423337. The reversal of 81423307 is 70332418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81423307 - 2³ = 81423299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81423301) 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, 4194 + ... + 13432.

It is an arithmetic number, because the mean of its divisors is an integer number (11642400).

Almost surely, 2^81423307 is an apocalyptic number.

81423307 is a deficient number, since it is larger than the sum of its proper divisors (11715893).

81423307 is a wasteful number, since it uses less digits than its factorization.

81423307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 81423307 is about 9023.4864104735. The cubic root of 81423307 is about 433.4272833112.

It can be divided in two parts, 8142 and 3307, that added together give a square (11449 = 107²).

The spelling of 81423307 in words is "eighty-one million, four hundred twenty-three thousand, three hundred seven".