7764390765 has 24 divisors (see below), whose sum is σ = 13460342688. Its totient is φ = 4140372960.

The previous prime is 7764390731. The next prime is 7764390769. The reversal of 7764390765 is 5670934677.

It is a de Polignac number, because none of the positive numbers 2^k-7764390765 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7764390769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 513970 + ... + 528860.

It is an arithmetic number, because the mean of its divisors is an integer number (560847612).

Almost surely, 2^7764390765 is an apocalyptic number.

It is an amenable number.

7764390765 is a deficient number, since it is larger than the sum of its proper divisors (5695951923).

7764390765 is a wasteful number, since it uses less digits than its factorization.

7764390765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26489 (or 26486 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 54.

The square root of 7764390765 is about 88115.7804539005. The cubic root of 7764390765 is about 1980.1699310843.

The spelling of 7764390765 in words is "seven billion, seven hundred sixty-four million, three hundred ninety thousand, seven hundred sixty-five".