81253808 has 10 divisors (see below), whose sum is σ = 157429284. Its totient is φ = 40626896.

The previous prime is 81253787. The next prime is 81253811. The reversal of 81253808 is 80835218.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2539166 + ... + 2539197.

Almost surely, 2^81253808 is an apocalyptic number.

It is an amenable number.

81253808 is a deficient number, since it is larger than the sum of its proper divisors (76175476).

81253808 is a wasteful number, since it uses less digits than its factorization.

81253808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5078371 (or 5078365 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 81253808 is about 9014.0894160198. The cubic root of 81253808 is about 433.1263190027.

The spelling of 81253808 in words is "eighty-one million, two hundred fifty-three thousand, eight hundred eight".