81612467 has 16 divisors (see below), whose sum is σ = 90132000. Its totient is φ = 73592064.

The previous prime is 81612457. The next prime is 81612469. The reversal of 81612467 is 76421618.

It is a cyclic number.

It is not a de Polignac number, because 81612467 - 2⁶ = 81612403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81612469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39209 + ... + 41237.

It is an arithmetic number, because the mean of its divisors is an integer number (5633250).

Almost surely, 2^81612467 is an apocalyptic number.

81612467 is a deficient number, since it is larger than the sum of its proper divisors (8519533).

81612467 is a wasteful number, since it uses less digits than its factorization.

81612467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150.

The product of its digits is 16128, while the sum is 35.

The square root of 81612467 is about 9033.9618662024. The cubic root of 81612467 is about 433.7626651563.

The spelling of 81612467 in words is "eighty-one million, six hundred twelve thousand, four hundred sixty-seven".