81890076 has 24 divisors (see below), whose sum is σ = 201134080. Its totient is φ = 25859952.

The previous prime is 81890063. The next prime is 81890077. The reversal of 81890076 is 67009818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81890077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179356 + ... + 179811.

Almost surely, 2^81890076 is an apocalyptic number.

It is an amenable number.

81890076 is an abundant number, since it is smaller than the sum of its proper divisors (119244004).

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

81890076 is a wasteful number, since it uses less digits than its factorization.

81890076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359193 (or 359191 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 81890076 is about 9049.3135651275. The cubic root of 81890076 is about 434.2539305530.

The spelling of 81890076 in words is "eighty-one million, eight hundred ninety thousand, seventy-six".