66399288 has 16 divisors (see below), whose sum is σ = 165998280. Its totient is φ = 22133088.

The previous prime is 66399287. The next prime is 66399323. The reversal of 66399288 is 88299366.

It is a self number, because there is not a number n which added to its sum of digits gives 66399288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66399287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383295 + ... + 1383342.

Almost surely, 2^66399288 is an apocalyptic number.

It is an amenable number.

66399288 is an abundant number, since it is smaller than the sum of its proper divisors (99598992).

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

66399288 is a wasteful number, since it uses less digits than its factorization.

66399288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766646 (or 2766642 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The square root of 66399288 is about 8148.5758264865. The cubic root of 66399288 is about 404.9373230244.

The spelling of 66399288 in words is "sixty-six million, three hundred ninety-nine thousand, two hundred eighty-eight".