51431744 has 56 divisors (see below), whose sum is σ = 125626368. Its totient is φ = 20344320.

The previous prime is 51431719. The next prime is 51431789. The reversal of 51431744 is 44713415.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1409 + ... + 10239.

It is an arithmetic number, because the mean of its divisors is an integer number (2243328).

Almost surely, 2^51431744 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 51431744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62813184).

51431744 is an abundant number, since it is smaller than the sum of its proper divisors (74194624).

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

51431744 is a wasteful number, since it uses less digits than its factorization.

51431744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8863 (or 8853 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 51431744 is about 7171.5928495698. The cubic root of 51431744 is about 371.8865033186.

The spelling of 51431744 in words is "fifty-one million, four hundred thirty-one thousand, seven hundred forty-four".