77798923 has 2 divisors, whose sum is σ = 77798924. Its totient is φ = 77798922.

The previous prime is 77798921. The next prime is 77798927. The reversal of 77798923 is 32989777.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77798923 - 2¹ = 77798921 is a prime.

Together with 77798921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77798921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38899461 + 38899462.

It is an arithmetic number, because the mean of its divisors is an integer number (38899462).

Almost surely, 2^77798923 is an apocalyptic number.

77798923 is a deficient number, since it is larger than the sum of its proper divisors (1).

77798923 is an equidigital number, since it uses as much as digits as its factorization.

77798923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 52.

The square root of 77798923 is about 8820.3697768291. The cubic root of 77798923 is about 426.8984012018.

The spelling of 77798923 in words is "seventy-seven million, seven hundred ninety-eight thousand, nine hundred twenty-three".