81996250 has 40 divisors (see below), whose sum is σ = 175668768. Its totient is φ = 28110000.

The previous prime is 81996221. The next prime is 81996283. The reversal of 81996250 is 5269918.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4065 + ... + 13435.

Almost surely, 2^81996250 is an apocalyptic number.

81996250 is an abundant number, since it is smaller than the sum of its proper divisors (93672518).

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

81996250 is an equidigital number, since it uses as much as digits as its factorization.

81996250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400 (or 9385 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 81996250 is about 9055.1780766587. The cubic root of 81996250 is about 434.4415257907.

The spelling of 81996250 in words is "eighty-one million, nine hundred ninety-six thousand, two hundred fifty".