81676860 has 48 divisors (see below), whose sum is σ = 229412736. Its totient is φ = 21712192.

The previous prime is 81676849. The next prime is 81676867. The reversal of 81676860 is 6867618.

It is a super-2 number, since 2×81676860² = 13342218918919200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81676867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18859 + ... + 22781.

It is an arithmetic number, because the mean of its divisors is an integer number (4779432).

Almost surely, 2^81676860 is an apocalyptic number.

It is an amenable number.

81676860 is an abundant number, since it is smaller than the sum of its proper divisors (147735876).

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

81676860 is a wasteful number, since it uses less digits than its factorization.

81676860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282 (or 4280 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 81676860 is about 9037.5251036996. The cubic root of 81676860 is about 433.8767160994.

The spelling of 81676860 in words is "eighty-one million, six hundred seventy-six thousand, eight hundred sixty".