66624788 has 6 divisors (see below), whose sum is σ = 116593386. Its totient is φ = 33312392.

The previous prime is 66624787. The next prime is 66624793. The reversal of 66624788 is 88742666.

It can be written as a sum of positive squares in only one way, i.e., 66552964 + 71824 = 8158^2 + 268^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66624787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328095 + ... + 8328102.

It is an arithmetic number, because the mean of its divisors is an integer number (19432231).

Almost surely, 2^66624788 is an apocalyptic number.

It is an amenable number.

66624788 is a deficient number, since it is larger than the sum of its proper divisors (49968598).

66624788 is a wasteful number, since it uses less digits than its factorization.

66624788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16656201 (or 16656199 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 66624788 is about 8162.4008722924. The cubic root of 66624788 is about 405.3952104169.

The spelling of 66624788 in words is "sixty-six million, six hundred twenty-four thousand, seven hundred eighty-eight".