66877990 has 16 divisors (see below), whose sum is σ = 120901248. Its totient is φ = 26635456.

The previous prime is 66877969. The next prime is 66877991. The reversal of 66877990 is 9977866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66877991) 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, 12022 + ... + 16681.

It is an arithmetic number, because the mean of its divisors is an integer number (7556328).

Almost surely, 2^66877990 is an apocalyptic number.

66877990 is a deficient number, since it is larger than the sum of its proper divisors (54023258).

66877990 is a wasteful number, since it uses less digits than its factorization.

66877990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28943.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 66877990 is about 8177.8964287890. The cubic root of 66877990 is about 405.9081182066.

The spelling of 66877990 in words is "sixty-six million, eight hundred seventy-seven thousand, nine hundred ninety".