45200721 has 16 divisors (see below), whose sum is σ = 61415424. Its totient is φ = 29565264.

The previous prime is 45200693. The next prime is 45200731. The reversal of 45200721 is 12700254.

45200721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 45200721 - 2⁵ = 45200689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45200731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41040 + ... + 42126.

It is an arithmetic number, because the mean of its divisors is an integer number (3838464).

Almost surely, 2^45200721 is an apocalyptic number.

It is an amenable number.

45200721 is a deficient number, since it is larger than the sum of its proper divisors (16214703).

45200721 is a wasteful number, since it uses less digits than its factorization.

45200721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 45200721 is about 6723.1481465159. The cubic root of 45200721 is about 356.2173928913.

Adding to 45200721 its reverse (12700254), we get a palindrome (57900975).

The spelling of 45200721 in words is "forty-five million, two hundred thousand, seven hundred twenty-one".