745255728 has 240 divisors, whose sum is σ = 2502339840. Its totient is φ = 210325248.

The previous prime is 745255711. The next prime is 745255757. The reversal of 745255728 is 827552547.

745255728 is a `hidden beast` number, since 74 + 5 + 2 + 5 + 572 + 8 = 666.

745255728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×745255728² = 1110812200233619968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3782926 + ... + 3783122.

It is an arithmetic number, because the mean of its divisors is an integer number (10426416).

Almost surely, 2^745255728 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 745255728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1251169920).

745255728 is an abundant number, since it is smaller than the sum of its proper divisors (1757084112).

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

745255728 is a wasteful number, since it uses less digits than its factorization.

745255728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 348 counting only the distinct ones).

The product of its digits is 784000, while the sum is 45.

The square root of 745255728 is about 27299.3723004761. The cubic root of 745255728 is about 906.6404839133.

The spelling of 745255728 in words is "seven hundred forty-five million, two hundred fifty-five thousand, seven hundred twenty-eight".