81488910 has 32 divisors (see below), whose sum is σ = 205868160. Its totient is φ = 20586528.

The previous prime is 81488893. The next prime is 81488941. The reversal of 81488910 is 1988418.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70912 + ... + 72051.

It is an arithmetic number, because the mean of its divisors is an integer number (6433380).

Almost surely, 2^81488910 is an apocalyptic number.

81488910 is an abundant number, since it is smaller than the sum of its proper divisors (124379250).

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

81488910 is a wasteful number, since it uses less digits than its factorization.

81488910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142992.

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 81488910 is about 9027.1208034456. The cubic root of 81488910 is about 433.5436566121.

The spelling of 81488910 in words is "eighty-one million, four hundred eighty-eight thousand, nine hundred ten".