81873250 has 16 divisors (see below), whose sum is σ = 153267192. Its totient is φ = 32749200.

The previous prime is 81873229. The next prime is 81873251. The reversal of 81873250 is 5237818.

It can be written as a sum of positive squares in 4 ways, for example, as 37344321 + 44528929 = 6111^2 + 6673^2 .

It is not an unprimeable number, because it can be changed into a prime (81873251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163497 + ... + 163996.

Almost surely, 2^81873250 is an apocalyptic number.

81873250 is a deficient number, since it is larger than the sum of its proper divisors (71393942).

81873250 is a wasteful number, since it uses less digits than its factorization.

81873250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327510 (or 327500 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 81873250 is about 9048.3838335915. The cubic root of 81873250 is about 434.2241863826.

The spelling of 81873250 in words is "eighty-one million, eight hundred seventy-three thousand, two hundred fifty".