45437721 has 32 divisors (see below), whose sum is σ = 73328640. Its totient is φ = 24447744.

The previous prime is 45437701. The next prime is 45437737. The reversal of 45437721 is 12773454.

45437721 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 45437721 - 2⁷ = 45437593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45437701) 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 31 ways as a sum of consecutive naturals, for example, 104721 + ... + 105153.

It is an arithmetic number, because the mean of its divisors is an integer number (2291520).

Almost surely, 2^45437721 is an apocalyptic number.

It is an amenable number.

45437721 is a deficient number, since it is larger than the sum of its proper divisors (27890919).

45437721 is a wasteful number, since it uses less digits than its factorization.

45437721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its digits is 23520, while the sum is 33.

The square root of 45437721 is about 6740.7507742091. The cubic root of 45437721 is about 356.8388903403.

The spelling of 45437721 in words is "forty-five million, four hundred thirty-seven thousand, seven hundred twenty-one".