81190928 has 40 divisors (see below), whose sum is σ = 193612608. Its totient is φ = 32118912.

The previous prime is 81190919. The next prime is 81190957. The reversal of 81190928 is 82909118.

It is a junction number, because it is equal to n+sod(n) for n = 81190891 and 81190900.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26426 + ... + 29337.

Almost surely, 2^81190928 is an apocalyptic number.

It is an amenable number.

81190928 is an abundant number, since it is smaller than the sum of its proper divisors (112421680).

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

81190928 is a wasteful number, since it uses less digits than its factorization.

81190928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55791 (or 55785 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 81190928 is about 9010.6008678667. The cubic root of 81190928 is about 433.0145621424.

The spelling of 81190928 in words is "eighty-one million, one hundred ninety thousand, nine hundred twenty-eight".