66590380 has 72 divisors (see below), whose sum is σ = 150132528. Its totient is φ = 24788736.

The previous prime is 66590371. The next prime is 66590401. The reversal of 66590380 is 8309566.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 622287 + ... + 622393.

It is an arithmetic number, because the mean of its divisors is an integer number (2085174).

Almost surely, 2^66590380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66590380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75066264).

66590380 is an abundant number, since it is smaller than the sum of its proper divisors (83542148).

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

66590380 is a wasteful number, since it uses less digits than its factorization.

66590380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 66590380 is about 8160.2928869006. The cubic root of 66590380 is about 405.3254103681.

The spelling of 66590380 in words is "sixty-six million, five hundred ninety thousand, three hundred eighty".