745520 has 20 divisors (see below), whose sum is σ = 1733520. Its totient is φ = 298176.

The previous prime is 745517. The next prime is 745529. The reversal of 745520 is 25547.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4580 + ... + 4739.

It is an arithmetic number, because the mean of its divisors is an integer number (86676).

2⁷⁴⁵⁵²⁰ is an apocalyptic number.

It is an amenable number.

745520 is an abundant number, since it is smaller than the sum of its proper divisors (988000).

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

745520 is a wasteful number, since it uses less digits than its factorization.

745520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9332 (or 9326 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 745520 is about 863.4350004488. The cubic root of 745520 is about 90.6747637905.

The spelling of 745520 in words is "seven hundred forty-five thousand, five hundred twenty".