51387744 has 48 divisors (see below), whose sum is σ = 135898560. Its totient is φ = 17001600.

The previous prime is 51387731. The next prime is 51387751. The reversal of 51387744 is 44778315.

It is a tau number, because it is divible by the number of its divisors (48).

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, 11419 + ... + 15269.

It is an arithmetic number, because the mean of its divisors is an integer number (2831220).

Almost surely, 2^51387744 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 51387744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67949280).

51387744 is an abundant number, since it is smaller than the sum of its proper divisors (84510816).

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

51387744 is a wasteful number, since it uses less digits than its factorization.

51387744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003 (or 3995 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 51387744 is about 7168.5245343794. The cubic root of 51387744 is about 371.7804230830.

The spelling of 51387744 in words is "fifty-one million, three hundred eighty-seven thousand, seven hundred forty-four".