7645309765 has 8 divisors (see below), whose sum is σ = 9184126968. Its totient is φ = 6109744320.

The previous prime is 7645309697. The next prime is 7645309781. The reversal of 7645309765 is 5679035467.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2075075809 + 5570233956 = 45553^2 + 74634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7645309765 - 2⁹ = 7645309253 is a prime.

It is a super-2 number, since 2×7645309765² (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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807762 + ... + 817171.

It is an arithmetic number, because the mean of its divisors is an integer number (1148015871).

Almost surely, 2^7645309765 is an apocalyptic number.

It is an amenable number.

7645309765 is a deficient number, since it is larger than the sum of its proper divisors (1538817203).

7645309765 is a wasteful number, since it uses less digits than its factorization.

7645309765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625879.

The product of its (nonzero) digits is 4762800, while the sum is 52.

The square root of 7645309765 is about 87437.4620228652. The cubic root of 7645309765 is about 1969.9945686847.

The spelling of 7645309765 in words is "seven billion, six hundred forty-five million, three hundred nine thousand, seven hundred sixty-five".