51512040 has 192 divisors, whose sum is σ = 187012800. Its totient is φ = 12220416.

The previous prime is 51512039. The next prime is 51512099. The reversal of 51512040 is 4021515.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116059 + ... + 116501.

It is an arithmetic number, because the mean of its divisors is an integer number (974025).

Almost surely, 2^51512040 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 51512040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93506400).

51512040 is an abundant number, since it is smaller than the sum of its proper divisors (135500760).

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

51512040 is a wasteful number, since it uses less digits than its factorization.

51512040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51512040 is about 7177.1888647297. The cubic root of 51512040 is about 372.0799342622.

Adding to 51512040 its reverse (4021515), we get a palindrome (55533555).

The spelling of 51512040 in words is "fifty-one million, five hundred twelve thousand, forty".