66386250 has 160 divisors (see below), whose sum is σ = 211432320. Its totient is φ = 15120000.

The previous prime is 66386233. The next prime is 66386279. The reversal of 66386250 is 5268366.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 236110 + ... + 236390.

It is an arithmetic number, because the mean of its divisors is an integer number (1321452).

Almost surely, 2^66386250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66386250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105716160).

66386250 is an abundant number, since it is smaller than the sum of its proper divisors (145046070).

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

66386250 is a wasteful number, since it uses less digits than its factorization.

66386250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 66386250 is about 8147.7757701105. The cubic root of 66386250 is about 404.9108171256.

The spelling of 66386250 in words is "sixty-six million, three hundred eighty-six thousand, two hundred fifty".