66899490 has 32 divisors (see below), whose sum is σ = 183496320. Its totient is φ = 15291264.

The previous prime is 66899489. The next prime is 66899507. The reversal of 66899490 is 9499866.

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, 159075 + ... + 159494.

It is an arithmetic number, because the mean of its divisors is an integer number (5734260).

Almost surely, 2^66899490 is an apocalyptic number.

66899490 is an abundant number, since it is smaller than the sum of its proper divisors (116596830).

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

66899490 is a wasteful number, since it uses less digits than its factorization.

66899490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318586.

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 66899490 is about 8179.2108421290. The cubic root of 66899490 is about 405.9516107892.

The spelling of 66899490 in words is "sixty-six million, eight hundred ninety-nine thousand, four hundred ninety".