66604340 has 24 divisors (see below), whose sum is σ = 152584992. Its totient is φ = 24219680.

The previous prime is 66604339. The next prime is 66604409. The reversal of 66604340 is 4340666.

It is a super-2 number, since 2×66604340² = 8872276213671200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151154 + ... + 151593.

It is an arithmetic number, because the mean of its divisors is an integer number (6357708).

Almost surely, 2^66604340 is an apocalyptic number.

It is an amenable number.

66604340 is an abundant number, since it is smaller than the sum of its proper divisors (85980652).

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

66604340 is a wasteful number, since it uses less digits than its factorization.

66604340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302767 (or 302765 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 66604340 is about 8161.1482035312. The cubic root of 66604340 is about 405.3537325140.

It can be divided in two parts, 66 and 604340, that added together give a palindrome (604406).

The spelling of 66604340 in words is "sixty-six million, six hundred four thousand, three hundred forty".