45021440 has 72 divisors (see below), whose sum is σ = 114239160. Its totient is φ = 16941056.

The previous prime is 45021407. The next prime is 45021463. The reversal of 45021440 is 4412054.

It can be written as a sum of positive squares in 4 ways, for example, as 3444736 + 41576704 = 1856^2 + 6448^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20726 + ... + 22794.

It is an arithmetic number, because the mean of its divisors is an integer number (1586655).

Almost surely, 2^45021440 is an apocalyptic number.

45021440 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 45021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57119580).

45021440 is an abundant number, since it is smaller than the sum of its proper divisors (69217720).

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

45021440 is a wasteful number, since it uses less digits than its factorization.

45021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107 (or 2093 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 45021440 is about 6709.8017854479. The cubic root of 45021440 is about 355.7458102153.

Adding to 45021440 its reverse (4412054), we get a palindrome (49433494).

The spelling of 45021440 in words is "forty-five million, twenty-one thousand, four hundred forty".