77791255 has 4 divisors (see below), whose sum is σ = 93349512. Its totient is φ = 62233000.

The previous prime is 77791249. The next prime is 77791277. The reversal of 77791255 is 55219777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55219777 = 2333 ⋅23669.

It is not a de Polignac number, because 77791255 - 2⁵ = 77791223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7779121 + ... + 7779130.

It is an arithmetic number, because the mean of its divisors is an integer number (23337378).

Almost surely, 2^77791255 is an apocalyptic number.

77791255 is a deficient number, since it is larger than the sum of its proper divisors (15558257).

77791255 is a wasteful number, since it uses less digits than its factorization.

77791255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15558256.

The product of its digits is 154350, while the sum is 43.

The square root of 77791255 is about 8819.9350904641. The cubic root of 77791255 is about 426.8843754528.

The spelling of 77791255 in words is "seventy-seven million, seven hundred ninety-one thousand, two hundred fifty-five".