7724080645 has 32 divisors (see below), whose sum is σ = 9907969248. Its totient is φ = 5760442368.

The previous prime is 7724080613. The next prime is 7724080681. The reversal of 7724080645 is 5460804277.

It can be written as a sum of positive squares in 16 ways, for example, as 1413684801 + 6310395844 = 37599^2 + 79438^2 .

It is a cyclic number.

It is not a de Polignac number, because 7724080645 - 2⁵ = 7724080613 is a prime.

It is a super-2 number, since 2×7724080645² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4660657 + ... + 4662313.

It is an arithmetic number, because the mean of its divisors is an integer number (309624039).

Almost surely, 2^7724080645 is an apocalyptic number.

It is an amenable number.

7724080645 is a deficient number, since it is larger than the sum of its proper divisors (2183888603).

7724080645 is a wasteful number, since it uses less digits than its factorization.

7724080645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169.

The product of its (nonzero) digits is 376320, while the sum is 43.

The square root of 7724080645 is about 87886.7489727547. The cubic root of 7724080645 is about 1976.7371903317.

The spelling of 7724080645 in words is "seven billion, seven hundred twenty-four million, eighty thousand, six hundred forty-five".