77922473 has 2 divisors, whose sum is σ = 77922474. Its totient is φ = 77922472.

The previous prime is 77922457. The next prime is 77922479. The reversal of 77922473 is 37422977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73222249 + 4700224 = 8557^2 + 2168^2 .

It is a cyclic number.

It is not a de Polignac number, because 77922473 - 2⁴ = 77922457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77922473.

It is not a weakly prime, because it can be changed into another prime (77922479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961236 + 38961237.

It is an arithmetic number, because the mean of its divisors is an integer number (38961237).

Almost surely, 2^77922473 is an apocalyptic number.

It is an amenable number.

77922473 is a deficient number, since it is larger than the sum of its proper divisors (1).

77922473 is an equidigital number, since it uses as much as digits as its factorization.

77922473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 41.

The square root of 77922473 is about 8827.3706730827. The cubic root of 77922473 is about 427.1242629492.

The spelling of 77922473 in words is "seventy-seven million, nine hundred twenty-two thousand, four hundred seventy-three".