51250320 has 200 divisors, whose sum is σ = 194451840. Its totient is φ = 12407040.

The previous prime is 51250267. The next prime is 51250321. The reversal of 51250320 is 2305215.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 51250293 and 51250302.

It is not an unprimeable number, because it can be changed into a prime (51250321) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70921 + ... + 71639.

Almost surely, 2^51250320 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 51250320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97225920).

51250320 is an abundant number, since it is smaller than the sum of its proper divisors (143201520).

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

51250320 is a wasteful number, since it uses less digits than its factorization.

51250320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 51250320 is about 7158.9328813728. The cubic root of 51250320 is about 371.4487151656.

Adding to 51250320 its reverse (2305215), we get a palindrome (53555535).

The spelling of 51250320 in words is "fifty-one million, two hundred fifty thousand, three hundred twenty".