756690065 has 4 divisors (see below), whose sum is σ = 908028084. Its totient is φ = 605352048.

The previous prime is 756690059. The next prime is 756690073. The reversal of 756690065 is 560096657.

It is a Cunningham number, because it is equal to 27508²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560096657 = 131 ⋅4275547.

It can be written as a sum of positive squares in 2 ways, for example, as 272382016 + 484308049 = 16504^2 + 22007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-756690065 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 756689998 and 756690025.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75669002 + ... + 75669011.

It is an arithmetic number, because the mean of its divisors is an integer number (227007021).

Almost surely, 2^756690065 is an apocalyptic number.

It is an amenable number.

756690065 is a deficient number, since it is larger than the sum of its proper divisors (151338019).

756690065 is a wasteful number, since it uses less digits than its factorization.

756690065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151338018.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 756690065 is about 27508.0000181765. Note that the first 4 decimals coincide. The cubic root of 756690065 is about 911.2537823734.

The spelling of 756690065 in words is "seven hundred fifty-six million, six hundred ninety thousand, sixty-five".