51438144 has 28 divisors (see below), whose sum is σ = 136097264. Its totient is φ = 17145984.

The previous prime is 51438139. The next prime is 51438161. The reversal of 51438144 is 44183415.

It is a super-3 number, since 3×51438144³ (a number of 24 digits) contains 333 as substring.

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, 133762 + ... + 134145.

Almost surely, 2^51438144 is an apocalyptic number.

It is an amenable number.

51438144 is an abundant number, since it is smaller than the sum of its proper divisors (84659120).

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

51438144 is a wasteful number, since it uses less digits than its factorization.

51438144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267922 (or 267912 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 51438144 is about 7172.0390406076. The cubic root of 51438144 is about 371.9019281303.

The spelling of 51438144 in words is "fifty-one million, four hundred thirty-eight thousand, one hundred forty-four".