51063440 has 40 divisors (see below), whose sum is σ = 119242368. Its totient is φ = 20336000.

The previous prime is 51063437. The next prime is 51063449. The reversal of 51063440 is 4436015.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (51063449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18809 + ... + 21351.

Almost surely, 2^51063440 is an apocalyptic number.

It is an amenable number.

51063440 is an abundant number, since it is smaller than the sum of its proper divisors (68178928).

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

51063440 is a wasteful number, since it uses less digits than its factorization.

51063440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807 (or 2801 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 51063440 is about 7145.8687365498. The cubic root of 51063440 is about 370.9966797387.

Adding to 51063440 its reverse (4436015), we get a palindrome (55499455).

The spelling of 51063440 in words is "fifty-one million, sixty-three thousand, four hundred forty".