81610250 has 16 divisors (see below), whose sum is σ = 152774856. Its totient is φ = 32644000.

The previous prime is 81610247. The next prime is 81610261. The reversal of 81610250 is 5201618.

It can be written as a sum of positive squares in 4 ways, for example, as 52461049 + 29149201 = 7243^2 + 5399^2 .

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, 162971 + ... + 163470.

Almost surely, 2^81610250 is an apocalyptic number.

81610250 is a deficient number, since it is larger than the sum of its proper divisors (71164606).

81610250 is a wasteful number, since it uses less digits than its factorization.

81610250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326458 (or 326448 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 81610250 is about 9033.8391617296. The cubic root of 81610250 is about 433.7587374045.

Adding to 81610250 its reverse (5201618), we get a palindrome (86811868).

The spelling of 81610250 in words is "eighty-one million, six hundred ten thousand, two hundred fifty".