81447674 has 16 divisors (see below), whose sum is σ = 152318016. Its totient is φ = 31732800.

The previous prime is 81447659. The next prime is 81447701. The reversal of 81447674 is 47674418.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264287 + ... + 264594.

It is an arithmetic number, because the mean of its divisors is an integer number (9519876).

Almost surely, 2^81447674 is an apocalyptic number.

81447674 is a deficient number, since it is larger than the sum of its proper divisors (70870342).

81447674 is a wasteful number, since it uses less digits than its factorization.

81447674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528901.

The product of its digits is 150528, while the sum is 41.

The square root of 81447674 is about 9024.8365082144. The cubic root of 81447674 is about 433.4705152786.

The spelling of 81447674 in words is "eighty-one million, four hundred forty-seven thousand, six hundred seventy-four".