81902860 has 24 divisors (see below), whose sum is σ = 185227056. Its totient is φ = 30240960.

The previous prime is 81902833. The next prime is 81902881. The reversal of 81902860 is 6820918.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157246 + ... + 157765.

It is an arithmetic number, because the mean of its divisors is an integer number (7717794).

Almost surely, 2^81902860 is an apocalyptic number.

It is an amenable number.

81902860 is an abundant number, since it is smaller than the sum of its proper divisors (103324196).

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

81902860 is a wasteful number, since it uses less digits than its factorization.

81902860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315033 (or 315031 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 81902860 is about 9050.0198894809. The cubic root of 81902860 is about 434.2765267521.

The spelling of 81902860 in words is "eighty-one million, nine hundred two thousand, eight hundred sixty".