51287040 has 352 divisors, whose sum is σ = 212232960. Its totient is φ = 11501568.

The previous prime is 51287029. The next prime is 51287059. The reversal of 51287040 is 4078215.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51286995 and 51287013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 967654 + ... + 967706.

Almost surely, 2^51287040 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 51287040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106116480).

51287040 is an abundant number, since it is smaller than the sum of its proper divisors (160945920).

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

51287040 is a wasteful number, since it uses less digits than its factorization.

51287040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 51287040 is about 7161.4970501984. The cubic root of 51287040 is about 371.5374062580.

The spelling of 51287040 in words is "fifty-one million, two hundred eighty-seven thousand, forty".