81890496 has 84 divisors (see below), whose sum is σ = 248561352. Its totient is φ = 25688064.

The previous prime is 81890483. The next prime is 81890527. The reversal of 81890496 is 69409818.

81890496 is a `hidden beast` number, since 81 + 89 + 0 + 496 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5611 + ... + 13973.

Almost surely, 2^81890496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81890496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124280676).

81890496 is an abundant number, since it is smaller than the sum of its proper divisors (166670856).

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

81890496 is a wasteful number, since it uses less digits than its factorization.

81890496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8398 (or 8385 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 81890496 is about 9049.3367712778. The cubic root of 81890496 is about 434.2546729561.

The spelling of 81890496 in words is "eighty-one million, eight hundred ninety thousand, four hundred ninety-six".