45251440 has 60 divisors (see below), whose sum is σ = 113959224. Its totient is φ = 16703232.

The previous prime is 45251429. The next prime is 45251441. The reversal of 45251440 is 4415254.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45251441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11847 + ... + 15193.

Almost surely, 2^45251440 is an apocalyptic number.

45251440 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 45251440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56979612).

45251440 is an abundant number, since it is smaller than the sum of its proper divisors (68707784).

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

45251440 is a wasteful number, since it uses less digits than its factorization.

45251440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386 (or 3367 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 45251440 is about 6726.9190570424. The cubic root of 45251440 is about 356.3505783523.

Adding to 45251440 its reverse (4415254), we get a palindrome (49666694).

The spelling of 45251440 in words is "forty-five million, two hundred fifty-one thousand, four hundred forty".