77120797 has 4 divisors (see below), whose sum is σ = 83053180. Its totient is φ = 71188416.

The previous prime is 77120783. The next prime is 77120803. The reversal of 77120797 is 79702177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6661561 + 70459236 = 2581^2 + 8394^2 .

It is not a de Polignac number, because 77120797 - 2¹⁵ = 77088029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77120717) 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, 2966172 + ... + 2966197.

It is an arithmetic number, because the mean of its divisors is an integer number (20763295).

Almost surely, 2^77120797 is an apocalyptic number.

It is an amenable number.

77120797 is a deficient number, since it is larger than the sum of its proper divisors (5932383).

77120797 is a wasteful number, since it uses less digits than its factorization.

77120797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5932382.

The product of its (nonzero) digits is 43218, while the sum is 40.

The square root of 77120797 is about 8781.8447378669. The cubic root of 77120797 is about 425.6544417897.

The spelling of 77120797 in words is "seventy-seven million, one hundred twenty thousand, seven hundred ninety-seven".