66677790 has 16 divisors (see below), whose sum is σ = 160026768. Its totient is φ = 17780736.

The previous prime is 66677789. The next prime is 66677813. The reversal of 66677790 is 9777666.

It is a super-3 number, since 3×66677790³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1111267 + ... + 1111326.

It is an arithmetic number, because the mean of its divisors is an integer number (10001673).

Almost surely, 2^66677790 is an apocalyptic number.

66677790 is an abundant number, since it is smaller than the sum of its proper divisors (93348978).

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

66677790 is a wasteful number, since it uses less digits than its factorization.

66677790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222603.

The product of its (nonzero) digits is 666792, while the sum is 48.

The square root of 66677790 is about 8165.6469431393. The cubic root of 66677790 is about 405.5026832375.

The spelling of 66677790 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred ninety".