772991077 has 16 divisors (see below), whose sum is σ = 797448240. Its totient is φ = 749056000.

The previous prime is 772991059. The next prime is 772991099. The reversal of 772991077 is 770199277.

It can be written as a sum of positive squares in 8 ways, for example, as 222337921 + 550653156 = 14911^2 + 23466^2 .

It is a cyclic number.

It is not a de Polignac number, because 772991077 - 2⁷ = 772990949 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 772991077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772991047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015377 + ... + 1016137.

It is an arithmetic number, because the mean of its divisors is an integer number (49840515).

Almost surely, 2^772991077 is an apocalyptic number.

It is an amenable number.

772991077 is a deficient number, since it is larger than the sum of its proper divisors (24457163).

772991077 is a wasteful number, since it uses less digits than its factorization.

772991077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064.

The product of its (nonzero) digits is 388962, while the sum is 49.

The square root of 772991077 is about 27802.7170794511. The cubic root of 772991077 is about 917.7509165319.

The spelling of 772991077 in words is "seven hundred seventy-two million, nine hundred ninety-one thousand, seventy-seven".