81672708 has 24 divisors (see below), whose sum is σ = 205229248. Its totient is φ = 25130016.

The previous prime is 81672691. The next prime is 81672713. The reversal of 81672708 is 80727618.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 261616 + ... + 261927.

Almost surely, 2^81672708 is an apocalyptic number.

It is an amenable number.

81672708 is an abundant number, since it is smaller than the sum of its proper divisors (123556540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81672708 is a wasteful number, since it uses less digits than its factorization.

81672708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523563 (or 523561 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 81672708 is about 9037.2953918747. The cubic root of 81672708 is about 433.8693640104.

The spelling of 81672708 in words is "eighty-one million, six hundred seventy-two thousand, seven hundred eight".