756280661 has 4 divisors (see below), whose sum is σ = 756337152. Its totient is φ = 756224172.

The previous prime is 756280621. The next prime is 756280663. The reversal of 756280661 is 166082657.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 166082657 = 13 ⋅12775589.

It is a cyclic number.

It is not a de Polignac number, because 756280661 - 2⁶ = 756280597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (756280663) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4460 + ... + 39146.

It is an arithmetic number, because the mean of its divisors is an integer number (189084288).

Almost surely, 2^756280661 is an apocalyptic number.

It is an amenable number.

756280661 is a deficient number, since it is larger than the sum of its proper divisors (56491).

756280661 is a wasteful number, since it uses less digits than its factorization.

756280661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56490.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 756280661 is about 27500.5574670769. The cubic root of 756280661 is about 911.0894093741.

The spelling of 756280661 in words is "seven hundred fifty-six million, two hundred eighty thousand, six hundred sixty-one".