66831250 has 72 divisors (see below), whose sum is σ = 136702188. Its totient is φ = 24480000.

The previous prime is 66831211. The next prime is 66831277. The reversal of 66831250 is 5213866.

It can be written as a sum of positive squares in 18 ways, for example, as 22382361 + 44448889 = 4731^2 + 6667^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1806232 + ... + 1806268.

Almost surely, 2^66831250 is an apocalyptic number.

66831250 is an abundant number, since it is smaller than the sum of its proper divisors (69870938).

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

66831250 is an equidigital number, since it uses as much as digits as its factorization.

66831250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 66831250 is about 8175.0382262103. The cubic root of 66831250 is about 405.8135351859.

It can be divided in two parts, 66831 and 250, that added together give a square (67081 = 259²).

The spelling of 66831250 in words is "sixty-six million, eight hundred thirty-one thousand, two hundred fifty".