728625645 has 128 divisors (see below), whose sum is σ = 1477440000. Its totient is φ = 337582080.

The previous prime is 728625619. The next prime is 728625649. The reversal of 728625645 is 546526827.

728625645 is a `hidden beast` number, since 7 + 2 + 86 + 2 + 564 + 5 = 666.

It is not a de Polignac number, because 728625645 - 2¹⁴ = 728609261 is a prime.

It is a super-3 number, since 3×728625645³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (806400) is a multiple of the sum of its prime factors (300).

It is a self number, because there is not a number n which added to its sum of digits gives 728625645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728625649) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4890031 + ... + 4890179.

It is an arithmetic number, because the mean of its divisors is an integer number (11542500).

Almost surely, 2^728625645 is an apocalyptic number.

It is an amenable number.

728625645 is an abundant number, since it is smaller than the sum of its proper divisors (748814355).

728625645 is a wasteful number, since it uses less digits than its factorization.

728625645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 294 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 728625645 is about 26993.0666097796. The cubic root of 728625645 is about 899.8459180668.

The spelling of 728625645 in words is "seven hundred twenty-eight million, six hundred twenty-five thousand, six hundred forty-five".