81464667 has 4 divisors (see below), whose sum is σ = 108619560. Its totient is φ = 54309776.

The previous prime is 81464659. The next prime is 81464687. The reversal of 81464667 is 76646418.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81464667 - 2³ = 81464659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81464687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13577442 + ... + 13577447.

It is an arithmetic number, because the mean of its divisors is an integer number (27154890).

Almost surely, 2^81464667 is an apocalyptic number.

81464667 is a deficient number, since it is larger than the sum of its proper divisors (27154893).

81464667 is a wasteful number, since it uses less digits than its factorization.

81464667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27154892.

The product of its digits is 193536, while the sum is 42.

The square root of 81464667 is about 9025.7779166120. Note that the first 3 decimals coincide. The cubic root of 81464667 is about 433.5006591812.

The spelling of 81464667 in words is "eighty-one million, four hundred sixty-four thousand, six hundred sixty-seven".