77669213 has 2 divisors, whose sum is σ = 77669214. Its totient is φ = 77669212.

The previous prime is 77669201. The next prime is 77669219. The reversal of 77669213 is 31296677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67601284 + 10067929 = 8222^2 + 3173^2 .

It is a cyclic number.

It is not a de Polignac number, because 77669213 - 2²⁰ = 76620637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77669219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38834606 + 38834607.

It is an arithmetic number, because the mean of its divisors is an integer number (38834607).

Almost surely, 2^77669213 is an apocalyptic number.

It is an amenable number.

77669213 is a deficient number, since it is larger than the sum of its proper divisors (1).

77669213 is an equidigital number, since it uses as much as digits as its factorization.

77669213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 41.

The square root of 77669213 is about 8813.0138431753. The cubic root of 77669213 is about 426.6610209078.

The spelling of 77669213 in words is "seventy-seven million, six hundred sixty-nine thousand, two hundred thirteen".