45445540 has 72 divisors (see below), whose sum is σ = 112613760. Its totient is φ = 15357888.

The previous prime is 45445529. The next prime is 45445559. The reversal of 45445540 is 4554454.

It is a happy number.

45445540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 77127 + ... + 77713.

It is an arithmetic number, because the mean of its divisors is an integer number (1564080).

Almost surely, 2^45445540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45445540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56306880).

45445540 is an abundant number, since it is smaller than the sum of its proper divisors (67168220).

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

45445540 is a wasteful number, since it uses less digits than its factorization.

45445540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 31.

The square root of 45445540 is about 6741.3307291662. The cubic root of 45445540 is about 356.8593576466.

Adding to 45445540 its reverse (4554454), we get a palindrome (49999994).

The spelling of 45445540 in words is "forty-five million, four hundred forty-five thousand, five hundred forty".