776792641 has 9 divisors (see below), whose sum is σ = 795012451. Its totient is φ = 758983072.

The previous prime is 776792633. The next prime is 776792647. The reversal of 776792641 is 146297677.

The square root of 776792641 is 27871.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 477641025 + 299151616 = 21855^2 + 17296^2 .

It is not a de Polignac number, because 776792641 - 2³ = 776792633 is a prime.

It is a super-2 number, since 2×776792641² = 1206813614223509762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (776792647) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1309641 + ... + 1310233.

Almost surely, 2^776792641 is an apocalyptic number.

776792641 is the 27871-st square number.

776792641 is the 13936-th centered octagonal number.

It is an amenable number.

776792641 is a deficient number, since it is larger than the sum of its proper divisors (18219810).

776792641 is an frugal number, since it uses more digits than its factorization.

776792641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280 (or 640 counting only the distinct ones).

The product of its digits is 889056, while the sum is 49.

The cubic root of 776792641 is about 919.2529541284.

Multiplying 776792641 by its sum of digits (49), we get a square (38062839409 = 195097²).

The spelling of 776792641 in words is "seven hundred seventy-six million, seven hundred ninety-two thousand, six hundred forty-one".