81102790 has 16 divisors (see below), whose sum is σ = 147351312. Its totient is φ = 32137504.

The previous prime is 81102751. The next prime is 81102817. The reversal of 81102790 is 9720118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36829 + ... + 38968.

It is an arithmetic number, because the mean of its divisors is an integer number (9209457).

Almost surely, 2^81102790 is an apocalyptic number.

81102790 is a deficient number, since it is larger than the sum of its proper divisors (66248522).

81102790 is a wasteful number, since it uses less digits than its factorization.

81102790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75911.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 81102790 is about 9005.7087450128. The cubic root of 81102790 is about 432.8578169782.

The spelling of 81102790 in words is "eighty-one million, one hundred two thousand, seven hundred ninety".