81877800 has 48 divisors (see below), whose sum is σ = 253823040. Its totient is φ = 21833920.

The previous prime is 81877793. The next prime is 81877813. The reversal of 81877800 is 877818.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67632 + ... + 68831.

It is an arithmetic number, because the mean of its divisors is an integer number (5287980).

Almost surely, 2^81877800 is an apocalyptic number.

It is an amenable number.

81877800 is an abundant number, since it is smaller than the sum of its proper divisors (171945240).

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

81877800 is a wasteful number, since it uses less digits than its factorization.

81877800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136482 (or 136473 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 81877800 is about 9048.6352562141. The cubic root of 81877800 is about 434.2322300494.

The spelling of 81877800 in words is "eighty-one million, eight hundred seventy-seven thousand, eight hundred".