51287504 has 40 divisors (see below), whose sum is σ = 105973128. Its totient is φ = 23961600.

The previous prime is 51287503. The next prime is 51287543. The reversal of 51287504 is 40578215.

It can be written as a sum of positive squares in 4 ways, for example, as 193600 + 51093904 = 440^2 + 7148^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42104 + ... + 43304.

Almost surely, 2^51287504 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 51287504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52986564).

51287504 is an abundant number, since it is smaller than the sum of its proper divisors (54685624).

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

51287504 is a wasteful number, since it uses less digits than its factorization.

51287504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383 (or 1377 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 51287504 is about 7161.5294455863. The cubic root of 51287504 is about 371.5385267025.

The spelling of 51287504 in words is "fifty-one million, two hundred eighty-seven thousand, five hundred four".