81903250 has 128 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 26208000.

The previous prime is 81903247. The next prime is 81903277. The reversal of 81903250 is 5230918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1036711 + ... + 1036789.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^81903250 is an apocalyptic number.

81903250 is an abundant number, since it is smaller than the sum of its proper divisors (106794350).

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

81903250 is a wasteful number, since it uses less digits than its factorization.

81903250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 81903250 is about 9050.0414363692. The cubic root of 81903250 is about 434.2772160548.

The spelling of 81903250 in words is "eighty-one million, nine hundred three thousand, two hundred fifty".