77675621 has 2 divisors, whose sum is σ = 77675622. Its totient is φ = 77675620.

The previous prime is 77675573. The next prime is 77675639. The reversal of 77675621 is 12657677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43744996 + 33930625 = 6614^2 + 5825^2 .

It is a cyclic number.

It is not a de Polignac number, because 77675621 - 2¹⁴ = 77659237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77675651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38837810 + 38837811.

It is an arithmetic number, because the mean of its divisors is an integer number (38837811).

Almost surely, 2^77675621 is an apocalyptic number.

It is an amenable number.

77675621 is a deficient number, since it is larger than the sum of its proper divisors (1).

77675621 is an equidigital number, since it uses as much as digits as its factorization.

77675621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 41.

The square root of 77675621 is about 8813.3773889469. The cubic root of 77675621 is about 426.6727542941.

The spelling of 77675621 in words is "seventy-seven million, six hundred seventy-five thousand, six hundred twenty-one".