66690250 has 32 divisors (see below), whose sum is σ = 136199232. Its totient is φ = 24250000.

The previous prime is 66690241. The next prime is 66690257. The reversal of 66690250 is 5209666.

It is not an unprimeable number, because it can be changed into a prime (66690257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9376 + ... + 14875.

It is an arithmetic number, because the mean of its divisors is an integer number (4256226).

Almost surely, 2^66690250 is an apocalyptic number.

66690250 is an abundant number, since it is smaller than the sum of its proper divisors (69508982).

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

66690250 is a wasteful number, since it uses less digits than its factorization.

66690250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24279 (or 24269 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66690250 is about 8166.4098599078. The cubic root of 66690250 is about 405.5279402671.

The spelling of 66690250 in words is "sixty-six million, six hundred ninety thousand, two hundred fifty".