756640 has 24 divisors (see below), whose sum is σ = 1787940. Its totient is φ = 302592.

The previous prime is 756629. The next prime is 756641. The reversal of 756640 is 46657.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 110224 = 804^2 + 332^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 756599 and 756608.

It is not an unprimeable number, because it can be changed into a prime (756641) 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, 2205 + ... + 2524.

2⁷⁵⁶⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

756640 is an abundant number, since it is smaller than the sum of its proper divisors (1031300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

756640 is a wasteful number, since it uses less digits than its factorization.

756640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744 (or 4736 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 756640 is about 869.8505618783. The cubic root of 756640 is about 91.1233684789.

The spelling of 756640 in words is "seven hundred fifty-six thousand, six hundred forty".