81676480 has 28 divisors (see below), whose sum is σ = 194492880. Its totient is φ = 32670464.

The previous prime is 81676477. The next prime is 81676531. The reversal of 81676480 is 8467618.

It is a Harshad number since it is a multiple of its sum of digits (40).

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 3 ways as a sum of consecutive naturals, for example, 127300 + ... + 127939.

Almost surely, 2^81676480 is an apocalyptic number.

81676480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81676480 is an abundant number, since it is smaller than the sum of its proper divisors (112816400).

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

81676480 is a wasteful number, since it uses less digits than its factorization.

81676480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255256 (or 255246 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 81676480 is about 9037.5040802204. The cubic root of 81676480 is about 433.8760432307.

The spelling of 81676480 in words is "eighty-one million, six hundred seventy-six thousand, four hundred eighty".