66788604 has 24 divisors (see below), whose sum is σ = 173155920. Its totient is φ = 22262832.

The previous prime is 66788567. The next prime is 66788609. The reversal of 66788604 is 40688766.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66788604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66788609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309099 + ... + 309314.

It is an arithmetic number, because the mean of its divisors is an integer number (7214830).

Almost surely, 2^66788604 is an apocalyptic number.

It is an amenable number.

66788604 is an abundant number, since it is smaller than the sum of its proper divisors (106367316).

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

66788604 is a wasteful number, since it uses less digits than its factorization.

66788604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618426 (or 618418 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 66788604 is about 8172.4295041316. The cubic root of 66788604 is about 405.7271982977.

The spelling of 66788604 in words is "sixty-six million, seven hundred eighty-eight thousand, six hundred four".