81908950 has 24 divisors (see below), whose sum is σ = 152590680. Its totient is φ = 32712000.

The previous prime is 81908923. The next prime is 81908951. The reversal of 81908950 is 5980918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81908951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55725 + ... + 57175.

It is an arithmetic number, because the mean of its divisors is an integer number (6357945).

Almost surely, 2^81908950 is an apocalyptic number.

81908950 is a deficient number, since it is larger than the sum of its proper divisors (70681730).

81908950 is a wasteful number, since it uses less digits than its factorization.

81908950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592 (or 2587 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 81908950 is about 9050.3563465755. The cubic root of 81908950 is about 434.2872902285.

The spelling of 81908950 in words is "eighty-one million, nine hundred eight thousand, nine hundred fifty".