81472647 has 16 divisors (see below), whose sum is σ = 114635520. Its totient is φ = 51365952.

The previous prime is 81472639. The next prime is 81472663. The reversal of 81472647 is 74627418.

It is not a de Polignac number, because 81472647 - 2³ = 81472639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81472747) 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, 493 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (7164720).

Almost surely, 2^81472647 is an apocalyptic number.

81472647 is a deficient number, since it is larger than the sum of its proper divisors (33162873).

81472647 is a wasteful number, since it uses less digits than its factorization.

81472647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13382.

The product of its digits is 75264, while the sum is 39.

The square root of 81472647 is about 9026.2199729455. The cubic root of 81472647 is about 433.5148134661.

The spelling of 81472647 in words is "eighty-one million, four hundred seventy-two thousand, six hundred forty-seven".