756449013 has 4 divisors (see below), whose sum is σ = 1008598688.
Its totient is φ = 504299340.
The previous prime is 756449009. The next prime is 756449027. The reversal of 756449013 is 310944657.
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 an emirpimes, since its reverse is a distinct semiprime: 310944657 = 3 ⋅103648219.
It is not a de Polignac number, because 756449013 - 22 = 756449009 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 (756449063) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126074833 + ... + 126074838.
It is an arithmetic number, because the mean of its divisors is an integer number (252149672).
Almost surely, 2756449013 is an apocalyptic number.
It is an amenable number.
756449013 is a deficient number, since it is larger than the sum of its proper divisors (252149675).
756449013 is a wasteful number, since it uses less digits than its factorization.
756449013 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 252149674.
The product of its (nonzero) digits is 90720, while the sum is 39.
The square root of 756449013 is about 27503.6181801595.
The cubic root of 756449013 is about 911.1570087687.
The spelling of 756449013 in words is "seven hundred fifty-six million, four hundred forty-nine thousand, thirteen".