66604140 has 48 divisors (see below), whose sum is σ = 207214560. Its totient is φ = 17760960.

The previous prime is 66604127. The next prime is 66604163. The reversal of 66604140 is 4140666.

It is a super-2 number, since 2×66604140² = 8872222930279200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61131 + ... + 62210.

It is an arithmetic number, because the mean of its divisors is an integer number (4316970).

Almost surely, 2^66604140 is an apocalyptic number.

66604140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66604140 is an abundant number, since it is smaller than the sum of its proper divisors (140610420).

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

66604140 is a wasteful number, since it uses less digits than its factorization.

66604140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123359 (or 123351 counting only the distinct ones).

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

The square root of 66604140 is about 8161.1359503442. The cubic root of 66604140 is about 405.3533267805.

The spelling of 66604140 in words is "sixty-six million, six hundred four thousand, one hundred forty".