772773861 has 4 divisors (see below), whose sum is σ = 1030365152. Its totient is φ = 515182572.

The previous prime is 772773857. The next prime is 772773893. The reversal of 772773861 is 168377277.

It is a happy number.

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 not a de Polignac number, because 772773861 - 2² = 772773857 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 772773861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772773821) 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, 128795641 + ... + 128795646.

It is an arithmetic number, because the mean of its divisors is an integer number (257591288).

Almost surely, 2^772773861 is an apocalyptic number.

It is an amenable number.

772773861 is a deficient number, since it is larger than the sum of its proper divisors (257591291).

772773861 is a wasteful number, since it uses less digits than its factorization.

772773861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257591290.

The product of its digits is 691488, while the sum is 48.

The square root of 772773861 is about 27798.8104241890. The cubic root of 772773861 is about 917.6649436296.

The spelling of 772773861 in words is "seven hundred seventy-two million, seven hundred seventy-three thousand, eight hundred sixty-one".