45244640 has 144 divisors (see below), whose sum is σ = 129276000. Its totient is φ = 14902272.

The previous prime is 45244637. The next prime is 45244651. The reversal of 45244640 is 4644254.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227261 + ... + 227459.

It is an arithmetic number, because the mean of its divisors is an integer number (897750).

Almost surely, 2^45244640 is an apocalyptic number.

45244640 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 45244640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64638000).

45244640 is an abundant number, since it is smaller than the sum of its proper divisors (84031360).

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

45244640 is a wasteful number, since it uses less digits than its factorization.

45244640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 45244640 is about 6726.4136060757. The cubic root of 45244640 is about 356.3327276841.

Adding to 45244640 its reverse (4644254), we get a palindrome (49888894).

The spelling of 45244640 in words is "forty-five million, two hundred forty-four thousand, six hundred forty".