45128709 has 6 divisors (see below), whose sum is σ = 65185926. Its totient is φ = 30085800.

The previous prime is 45128701. The next prime is 45128723. The reversal of 45128709 is 90782154.

It can be written as a sum of positive squares in only one way, i.e., 37822500 + 7306209 = 6150^2 + 2703^2 .

It is not a de Polignac number, because 45128709 - 2³ = 45128701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45128701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2507142 + ... + 2507159.

It is an arithmetic number, because the mean of its divisors is an integer number (10864321).

Almost surely, 2^45128709 is an apocalyptic number.

It is an amenable number.

45128709 is a deficient number, since it is larger than the sum of its proper divisors (20057217).

45128709 is a wasteful number, since it uses less digits than its factorization.

45128709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5014307 (or 5014304 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 45128709 is about 6717.7904849735. The cubic root of 45128709 is about 356.0281218579.

The spelling of 45128709 in words is "forty-five million, one hundred twenty-eight thousand, seven hundred nine".