45243720 has 96 divisors (see below), whose sum is σ = 148519800. Its totient is φ = 11943936.

The previous prime is 45243719. The next prime is 45243727. The reversal of 45243720 is 2734254.

It can be written as a sum of positive squares in 4 ways, for example, as 43322724 + 1920996 = 6582^2 + 1386^2 .

It is not an unprimeable number, because it can be changed into a prime (45243727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38664 + ... + 39816.

Almost surely, 2^45243720 is an apocalyptic number.

45243720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45243720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74259900).

45243720 is an abundant number, since it is smaller than the sum of its proper divisors (103276080).

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

45243720 is a wasteful number, since it uses less digits than its factorization.

45243720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 45243720 is about 6726.3452186161. The cubic root of 45243720 is about 356.3303124564.

Adding to 45243720 its reverse (2734254), we get a palindrome (47977974).

The spelling of 45243720 in words is "forty-five million, two hundred forty-three thousand, seven hundred twenty".