77208613 has 2 divisors, whose sum is σ = 77208614. Its totient is φ = 77208612.

The previous prime is 77208601. The next prime is 77208629. The reversal of 77208613 is 31680277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55845729 + 21362884 = 7473^2 + 4622^2 .

It is a cyclic number.

It is not a de Polignac number, because 77208613 - 2⁵ = 77208581 is a prime.

It is a super-2 number, since 2×77208613² = 11922339842767538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77208653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38604306 + 38604307.

It is an arithmetic number, because the mean of its divisors is an integer number (38604307).

Almost surely, 2^77208613 is an apocalyptic number.

It is an amenable number.

77208613 is a deficient number, since it is larger than the sum of its proper divisors (1).

77208613 is an equidigital number, since it uses as much as digits as its factorization.

77208613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 77208613 is about 8786.8431760218. The cubic root of 77208613 is about 425.8159420732.

The spelling of 77208613 in words is "seventy-seven million, two hundred eight thousand, six hundred thirteen".