45731728 has 80 divisors (see below), whose sum is σ = 108493056. Its totient is φ = 18247680.

The previous prime is 45731723. The next prime is 45731729. The reversal of 45731728 is 82713754.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45731723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105400 + ... + 105832.

Almost surely, 2^45731728 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 45731728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54246528).

45731728 is an abundant number, since it is smaller than the sum of its proper divisors (62761328).

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

45731728 is a wasteful number, since it uses less digits than its factorization.

45731728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 506 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 45731728 is about 6762.5237892373. The cubic root of 45731728 is about 357.6068841086.

The spelling of 45731728 in words is "forty-five million, seven hundred thirty-one thousand, seven hundred twenty-eight".