51233440 has 24 divisors (see below), whose sum is σ = 121039380. Its totient is φ = 20493312.

The previous prime is 51233437. The next prime is 51233453. The reversal of 51233440 is 4433215.

It can be written as a sum of positive squares in 2 ways, for example, as 50637456 + 595984 = 7116^2 + 772^2 .

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, 159945 + ... + 160264.

Almost surely, 2^51233440 is an apocalyptic number.

It is an amenable number.

51233440 is an abundant number, since it is smaller than the sum of its proper divisors (69805940).

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

51233440 is a wasteful number, since it uses less digits than its factorization.

51233440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320224 (or 320216 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 51233440 is about 7157.7538376225. The cubic root of 51233440 is about 371.4079301012.

Adding to 51233440 its reverse (4433215), we get a palindrome (55666655).

The spelling of 51233440 in words is "fifty-one million, two hundred thirty-three thousand, four hundred forty".