7746780645 has 24 divisors (see below), whose sum is σ = 13431379416. Its totient is φ = 4130500608.

The previous prime is 7746780637. The next prime is 7746780707. The reversal of 7746780645 is 5460876477.

It can be written as a sum of positive squares in 4 ways, for example, as 980566596 + 6766214049 = 31314^2 + 82257^2 .

It is not a de Polignac number, because 7746780645 - 2³ = 7746780637 is a prime.

It is a super-2 number, since 2×7746780645² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7746780591 and 7746780600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161349 + ... + 203781.

It is an arithmetic number, because the mean of its divisors is an integer number (559640809).

Almost surely, 2^7746780645 is an apocalyptic number.

It is an amenable number.

7746780645 is a deficient number, since it is larger than the sum of its proper divisors (5684598771).

7746780645 is a wasteful number, since it uses less digits than its factorization.

7746780645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46501 (or 46498 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 54.

The square root of 7746780645 is about 88015.7977013218. The cubic root of 7746780645 is about 1978.6717484343.

The spelling of 7746780645 in words is "seven billion, seven hundred forty-six million, seven hundred eighty thousand, six hundred forty-five".