81627808 has 24 divisors (see below), whose sum is σ = 166248180. Its totient is φ = 39406080.

The previous prime is 81627787. The next prime is 81627881. The reversal of 81627808 is 80872618.

It can be written as a sum of positive squares in 2 ways, for example, as 72795024 + 8832784 = 8532^2 + 2972^2 .

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, 43053 + ... + 44908.

Almost surely, 2^81627808 is an apocalyptic number.

It is an amenable number.

81627808 is an abundant number, since it is smaller than the sum of its proper divisors (84620372).

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

81627808 is a wasteful number, since it uses less digits than its factorization.

81627808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88000 (or 87992 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 81627808 is about 9034.8109000687. The cubic root of 81627808 is about 433.7898421158.

The spelling of 81627808 in words is "eighty-one million, six hundred twenty-seven thousand, eight hundred eight".