51965250 has 64 divisors (see below), whose sum is σ = 130740480. Its totient is φ = 13747200.

The previous prime is 51965237. The next prime is 51965261. The reversal of 51965250 is 5256915.

It is a Curzon 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, 144571 + ... + 144929.

It is an arithmetic number, because the mean of its divisors is an integer number (2042820).

Almost surely, 2^51965250 is an apocalyptic number.

51965250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51965250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65370240).

51965250 is an abundant number, since it is smaller than the sum of its proper divisors (78775230).

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

51965250 is a wasteful number, since it uses less digits than its factorization.

51965250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 51965250 is about 7208.6926692709. The cubic root of 51965250 is about 373.1679530753.

The spelling of 51965250 in words is "fifty-one million, nine hundred sixty-five thousand, two hundred fifty".