66140604 has 48 divisors (see below), whose sum is σ = 171914400. Its totient is φ = 21990528.

The previous prime is 66140603. The next prime is 66140611. The reversal of 66140604 is 40604166.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66140603) 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, 81352 + ... + 82160.

It is an arithmetic number, because the mean of its divisors is an integer number (3581550).

Almost surely, 2^66140604 is an apocalyptic number.

It is an amenable number.

66140604 is an abundant number, since it is smaller than the sum of its proper divisors (105773796).

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

66140604 is a wasteful number, since it uses less digits than its factorization.

66140604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1571 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 66140604 is about 8132.6873787205. The cubic root of 66140604 is about 404.4107755408.

The spelling of 66140604 in words is "sixty-six million, one hundred forty thousand, six hundred four".