66977930 has 16 divisors (see below), whose sum is σ = 121442760. Its totient is φ = 26595072.

The previous prime is 66977923. The next prime is 66977951. The reversal of 66977930 is 3977966.

It can be written as a sum of positive squares in 4 ways, for example, as 58079641 + 8898289 = 7621^2 + 2983^2 .

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, 23075 + ... + 25814.

Almost surely, 2^66977930 is an apocalyptic number.

66977930 is a deficient number, since it is larger than the sum of its proper divisors (54464830).

66977930 is a wasteful number, since it uses less digits than its factorization.

66977930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49033.

The product of its (nonzero) digits is 428652, while the sum is 47.

The square root of 66977930 is about 8184.0045210154. The cubic root of 66977930 is about 406.1102089447.

The spelling of 66977930 in words is "sixty-six million, nine hundred seventy-seven thousand, nine hundred thirty".