81053808 has 40 divisors (see below), whose sum is σ = 228425856. Its totient is φ = 24561600.

The previous prime is 81053783. The next prime is 81053821. The reversal of 81053808 is 80835018.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76228 + ... + 77283.

Almost surely, 2^81053808 is an apocalyptic number.

81053808 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81053808 is an abundant number, since it is smaller than the sum of its proper divisors (147372048).

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

81053808 is a wasteful number, since it uses less digits than its factorization.

81053808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153533 (or 153527 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 81053808 is about 9002.9888370474. The cubic root of 81053808 is about 432.7706579898.

The spelling of 81053808 in words is "eighty-one million, fifty-three thousand, eight hundred eight".