745579728 has 100 divisors (see below), whose sum is σ = 2163681828. Its totient is φ = 247864320.

The previous prime is 745579721. The next prime is 745579739. The reversal of 745579728 is 827975547.

It is a happy number.

745579728 is a `hidden beast` number, since 7 + 45 + 579 + 7 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 151585344 + 593994384 = 12312^2 + 24372^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745579721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 845848 + ... + 846728.

Almost surely, 2^745579728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 745579728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081840914).

745579728 is an abundant number, since it is smaller than the sum of its proper divisors (1418102100).

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

745579728 is a wasteful number, since it uses less digits than its factorization.

745579728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554 (or 1539 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 54.

The square root of 745579728 is about 27305.3058580196. The cubic root of 745579728 is about 906.7718522237.

The spelling of 745579728 in words is "seven hundred forty-five million, five hundred seventy-nine thousand, seven hundred twenty-eight".