81957108 has 36 divisors (see below), whose sum is σ = 201838560. Its totient is φ = 25879824.

The previous prime is 81957101. The next prime is 81957167. The reversal of 81957108 is 80175918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81957101) 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, 5128 + ... + 13791.

Almost surely, 2^81957108 is an apocalyptic number.

It is an amenable number.

81957108 is an abundant number, since it is smaller than the sum of its proper divisors (119881452).

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

81957108 is a wasteful number, since it uses less digits than its factorization.

81957108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18964 (or 18943 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 81957108 is about 9053.0165138477. The cubic root of 81957108 is about 434.3723859753.

The spelling of 81957108 in words is "eighty-one million, nine hundred fifty-seven thousand, one hundred eight".