77666427 has 12 divisors (see below), whose sum is σ = 112334040. Its totient is φ = 51708768.

The previous prime is 77666417. The next prime is 77666431. The reversal of 77666427 is 72466677.

It is not a de Polignac number, because 77666427 - 2⁴ = 77666411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77666417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1948 + ... + 12614.

It is an arithmetic number, because the mean of its divisors is an integer number (9361170).

Almost surely, 2^77666427 is an apocalyptic number.

77666427 is a deficient number, since it is larger than the sum of its proper divisors (34667613).

77666427 is a wasteful number, since it uses less digits than its factorization.

77666427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11482 (or 11479 counting only the distinct ones).

The product of its digits is 592704, while the sum is 45.

The square root of 77666427 is about 8812.8557800522. The cubic root of 77666427 is about 426.6559193935.

The spelling of 77666427 in words is "seventy-seven million, six hundred sixty-six thousand, four hundred twenty-seven".