77616401 has 2 divisors, whose sum is σ = 77616402. Its totient is φ = 77616400.

The previous prime is 77616397. The next prime is 77616439. The reversal of 77616401 is 10461677.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70980625 + 6635776 = 8425^2 + 2576^2 .

It is a cyclic number.

It is not a de Polignac number, because 77616401 - 2² = 77616397 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77616001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38808200 + 38808201.

It is an arithmetic number, because the mean of its divisors is an integer number (38808201).

Almost surely, 2^77616401 is an apocalyptic number.

It is an amenable number.

77616401 is a deficient number, since it is larger than the sum of its proper divisors (1).

77616401 is an equidigital number, since it uses as much as digits as its factorization.

77616401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 77616401 is about 8810.0170828438. The cubic root of 77616401 is about 426.5642947618.

The spelling of 77616401 in words is "seventy-seven million, six hundred sixteen thousand, four hundred one".