77275777 has 4 divisors (see below), whose sum is σ = 79768576. Its totient is φ = 74782980.

The previous prime is 77275771. The next prime is 77275787. The reversal of 77275777 is 77757277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77275777 - 2¹⁵ = 77243009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77275777.

It is not an unprimeable number, because it can be changed into a prime (77275771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1246353 + ... + 1246414.

It is an arithmetic number, because the mean of its divisors is an integer number (19942144).

Almost surely, 2^77275777 is an apocalyptic number.

It is an amenable number.

77275777 is a deficient number, since it is larger than the sum of its proper divisors (2492799).

77275777 is a wasteful number, since it uses less digits than its factorization.

77275777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492798.

The product of its digits is 1176490, while the sum is 49.

The square root of 77275777 is about 8790.6641956112. The cubic root of 77275777 is about 425.9393791350.

The spelling of 77275777 in words is "seventy-seven million, two hundred seventy-five thousand, seven hundred seventy-seven".