77623391 has 2 divisors, whose sum is σ = 77623392. Its totient is φ = 77623390.

The previous prime is 77623361. The next prime is 77623393. The reversal of 77623391 is 19332677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77623391 - 2⁶ = 77623327 is a prime.

Together with 77623393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77623393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38811695 + 38811696.

It is an arithmetic number, because the mean of its divisors is an integer number (38811696).

Almost surely, 2^77623391 is an apocalyptic number.

77623391 is a deficient number, since it is larger than the sum of its proper divisors (1).

77623391 is an equidigital number, since it uses as much as digits as its factorization.

77623391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 38.

The square root of 77623391 is about 8810.4137814293. The cubic root of 77623391 is about 426.5770995938.

The spelling of 77623391 in words is "seventy-seven million, six hundred twenty-three thousand, three hundred ninety-one".