756649 has 2 divisors, whose sum is σ = 756650. Its totient is φ = 756648.

The previous prime is 756641. The next prime is 756667. The reversal of 756649 is 946657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570025 + 186624 = 755^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 756649 - 2³ = 756641 is a prime.

It is not a weakly prime, because it can be changed into another prime (756641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 378324 + 378325.

It is an arithmetic number, because the mean of its divisors is an integer number (378325).

2⁷⁵⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

756649 is a deficient number, since it is larger than the sum of its proper divisors (1).

756649 is an equidigital number, since it uses as much as digits as its factorization.

756649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 756649 is about 869.8557351653. The cubic root of 756649 is about 91.1237297723.

It can be divided in two parts, 75 and 6649, that added together give a square (6724 = 82²).

The spelling of 756649 in words is "seven hundred fifty-six thousand, six hundred forty-nine".