81870902 has 8 divisors (see below), whose sum is σ = 125123616. Its totient is φ = 40163032.

The previous prime is 81870871. The next prime is 81870917. The reversal of 81870902 is 20907818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386078 + ... + 386289.

It is an arithmetic number, because the mean of its divisors is an integer number (15640452).

Almost surely, 2^81870902 is an apocalyptic number.

81870902 is a deficient number, since it is larger than the sum of its proper divisors (43252714).

81870902 is a wasteful number, since it uses less digits than its factorization.

81870902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772422.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 81870902 is about 9048.2540857339. The cubic root of 81870902 is about 434.2200353803.

The spelling of 81870902 in words is "eighty-one million, eight hundred seventy thousand, nine hundred two".