51463440 has 120 divisors (see below), whose sum is σ = 197540928. Its totient is φ = 11761920.

The previous prime is 51463417. The next prime is 51463453. The reversal of 51463440 is 4436415.

It is a tau number, because it is divible by the number of its divisors (120).

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, 66 + ... + 10145.

Almost surely, 2^51463440 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 51463440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98770464).

51463440 is an abundant number, since it is smaller than the sum of its proper divisors (146077488).

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

51463440 is a wasteful number, since it uses less digits than its factorization.

51463440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10237 (or 10228 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 51463440 is about 7173.8023390668. The cubic root of 51463440 is about 371.9628821793.

Adding to 51463440 its reverse (4436415), we get a palindrome (55899855).

The spelling of 51463440 in words is "fifty-one million, four hundred sixty-three thousand, four hundred forty".