77855893 has 2 divisors, whose sum is σ = 77855894. Its totient is φ = 77855892.

The previous prime is 77855819. The next prime is 77855941. The reversal of 77855893 is 39855877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77475204 + 380689 = 8802^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 77855893 - 2⁹ = 77855381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77855893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77855803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38927946 + 38927947.

It is an arithmetic number, because the mean of its divisors is an integer number (38927947).

Almost surely, 2^77855893 is an apocalyptic number.

It is an amenable number.

77855893 is a deficient number, since it is larger than the sum of its proper divisors (1).

77855893 is an equidigital number, since it uses as much as digits as its factorization.

77855893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 52.

The square root of 77855893 is about 8823.5986422774. The cubic root of 77855893 is about 427.0025777422.

The spelling of 77855893 in words is "seventy-seven million, eight hundred fifty-five thousand, eight hundred ninety-three".