797787797 has 4 divisors (see below), whose sum is σ = 804847980. Its totient is φ = 790727616.

The previous prime is 797787769. The next prime is 797787803.

797787797 is nontrivially palindromic in base 10.

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 86285521 + 711502276 = 9289^2 + 26674^2 .

It is a cyclic number.

It is not a de Polignac number, because 797787797 - 2⁶ = 797787733 is a prime.

It is a super-2 number, since 2×797787797² = 1272930738084226418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797786797) 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, 3529922 + ... + 3530147.

It is an arithmetic number, because the mean of its divisors is an integer number (201211995).

Almost surely, 2^797787797 is an apocalyptic number.

It is an amenable number.

797787797 is a deficient number, since it is larger than the sum of its proper divisors (7060183).

797787797 is a wasteful number, since it uses less digits than its factorization.

797787797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060182.

The product of its digits is 76236552, while the sum is 68.

The square root of 797787797 is about 28245.1375815378. The cubic root of 797787797 is about 927.4612987244.

The spelling of 797787797 in words is "seven hundred ninety-seven million, seven hundred eighty-seven thousand, seven hundred ninety-seven".