81713408 has 36 divisors (see below), whose sum is σ = 186412800. Its totient is φ = 35019264.

The previous prime is 81713393. The next prime is 81713431. The reversal of 81713408 is 80431718.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 21008 + ... + 24591.

Almost surely, 2^81713408 is an apocalyptic number.

It is an amenable number.

81713408 is an abundant number, since it is smaller than the sum of its proper divisors (104699392).

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

81713408 is an equidigital number, since it uses as much as digits as its factorization.

81713408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45622 (or 45608 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81713408 is about 9039.5468912994. The cubic root of 81713408 is about 433.9414221520.

The spelling of 81713408 in words is "eighty-one million, seven hundred thirteen thousand, four hundred eight".