81626672 has 20 divisors (see below), whose sum is σ = 158594016. Its totient is φ = 40699200.

The previous prime is 81626669. The next prime is 81626683. The reversal of 81626672 is 27662618.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079 + ... + 12822.

Almost surely, 2^81626672 is an apocalyptic number.

It is an amenable number.

81626672 is a deficient number, since it is larger than the sum of its proper divisors (76967344).

81626672 is a wasteful number, since it uses less digits than its factorization.

81626672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14276 (or 14270 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 81626672 is about 9034.7480319044. The cubic root of 81626672 is about 433.7878297806.

The spelling of 81626672 in words is "eighty-one million, six hundred twenty-six thousand, six hundred seventy-two".