756661 has 4 divisors (see below), whose sum is σ = 761824. Its totient is φ = 751500.

The previous prime is 756649. The next prime is 756667. The reversal of 756661 is 166657.

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.

It is a cyclic number.

It is not a de Polignac number, because 756661 - 2⁵ = 756629 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 (756667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2355 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (190456).

2⁷⁵⁶⁶⁶¹ is an apocalyptic number.

It is an amenable number.

756661 is a deficient number, since it is larger than the sum of its proper divisors (5163).

756661 is a wasteful number, since it uses less digits than its factorization.

756661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5162.

The product of its digits is 7560, while the sum is 31.

The square root of 756661 is about 869.8626328335. The cubic root of 756661 is about 91.1242114924.

The spelling of 756661 in words is "seven hundred fifty-six thousand, six hundred sixty-one".