45045720 has 80 divisors (see below), whose sum is σ = 151414560. Its totient is φ = 12011328.

The previous prime is 45045719. The next prime is 45045727. The reversal of 45045720 is 2754054.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45045727) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3712 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (1892682).

Almost surely, 2^45045720 is an apocalyptic number.

45045720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45045720 is an abundant number, since it is smaller than the sum of its proper divisors (106368840).

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

45045720 is a wasteful number, since it uses less digits than its factorization.

45045720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13926 (or 13913 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 45045720 is about 6711.6108349635. The cubic root of 45045720 is about 355.8097497961.

Adding to 45045720 its reverse (2754054), we get a palindrome (47799774).

The spelling of 45045720 in words is "forty-five million, forty-five thousand, seven hundred twenty".