745321540 has 12 divisors (see below), whose sum is σ = 1565175276. Its totient is φ = 298128608.

The previous prime is 745321523. The next prime is 745321543. The reversal of 745321540 is 45123547.

It can be written as a sum of positive squares in 2 ways, for example, as 159971904 + 585349636 = 12648^2 + 24194^2 .

It is not an unprimeable number, because it can be changed into a prime (745321543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18633019 + ... + 18633058.

It is an arithmetic number, because the mean of its divisors is an integer number (130431273).

Almost surely, 2^745321540 is an apocalyptic number.

It is an amenable number.

745321540 is an abundant number, since it is smaller than the sum of its proper divisors (819853736).

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

745321540 is a wasteful number, since it uses less digits than its factorization.

745321540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37266086 (or 37266084 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 745321540 is about 27300.5776495663. The cubic root of 745321540 is about 906.6671709796.

The spelling of 745321540 in words is "seven hundred forty-five million, three hundred twenty-one thousand, five hundred forty".