51024440 has 16 divisors (see below), whose sum is σ = 114805080. Its totient is φ = 20409760.

The previous prime is 51024433. The next prime is 51024473. The reversal of 51024440 is 4442015.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637766 + ... + 637845.

Almost surely, 2^51024440 is an apocalyptic number.

It is an amenable number.

51024440 is an abundant number, since it is smaller than the sum of its proper divisors (63780640).

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

51024440 is a wasteful number, since it uses less digits than its factorization.

51024440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275622 (or 1275618 counting only the distinct ones).

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

The square root of 51024440 is about 7143.1393658531. The cubic root of 51024440 is about 370.9022053905.

Adding to 51024440 its reverse (4442015), we get a palindrome (55466455).

The spelling of 51024440 in words is "fifty-one million, twenty-four thousand, four hundred forty".