745612721320 has 32 divisors (see below), whose sum is σ = 1677990832200. Its totient is φ = 298180695808.

The previous prime is 745612721311. The next prime is 745612721369. The reversal of 745612721320 is 23127216547.

It can be written as a sum of positive squares in 4 ways, for example, as 308355868804 + 437256852516 = 555298^2 + 661254^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1824475 + ... + 2195434.

Almost surely, 2^745612721320 is an apocalyptic number.

It is an amenable number.

745612721320 is an abundant number, since it is smaller than the sum of its proper divisors (932378110880).

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

745612721320 is a wasteful number, since it uses less digits than its factorization.

745612721320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024557 (or 4024553 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

Adding to 745612721320 its reverse (23127216547), we get a palindrome (768739937867).

The spelling of 745612721320 in words is "seven hundred forty-five billion, six hundred twelve million, seven hundred twenty-one thousand, three hundred twenty".