756649521 has 12 divisors (see below), whose sum is σ = 1150461520. Its totient is φ = 477883800.

The previous prime is 756649511. The next prime is 756649529. The reversal of 756649521 is 125946657.

It is not a de Polignac number, because 756649521 - 2⁵ = 756649489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (756649529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2212255 + ... + 2212596.

Almost surely, 2^756649521 is an apocalyptic number.

It is an amenable number.

756649521 is a deficient number, since it is larger than the sum of its proper divisors (393811999).

756649521 is a wasteful number, since it uses less digits than its factorization.

756649521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424876 (or 4424873 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 756649521 is about 27507.2630590541. The cubic root of 756649521 is about 911.2375068709.

The spelling of 756649521 in words is "seven hundred fifty-six million, six hundred forty-nine thousand, five hundred twenty-one".