66298690 has 16 divisors (see below), whose sum is σ = 122113728. Its totient is φ = 25902576.

The previous prime is 66298667. The next prime is 66298697. The reversal of 66298690 is 9689266.

It is a happy number.

It is a super-2 number, since 2×66298690² = 8791032591432200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66298690.

It is not an unprimeable number, because it can be changed into a prime (66298697) 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, 76662 + ... + 77521.

It is an arithmetic number, because the mean of its divisors is an integer number (7632108).

Almost surely, 2^66298690 is an apocalyptic number.

66298690 is a deficient number, since it is larger than the sum of its proper divisors (55815038).

66298690 is a wasteful number, since it uses less digits than its factorization.

66298690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154233.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 66298690 is about 8142.4007516211. The cubic root of 66298690 is about 404.7327200553.

The spelling of 66298690 in words is "sixty-six million, two hundred ninety-eight thousand, six hundred ninety".