51908220 has 144 divisors (see below), whose sum is σ = 193851840. Its totient is φ = 10948608.

The previous prime is 51908203. The next prime is 51908221. The reversal of 51908220 is 2280915.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51908221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14796 + ... + 17964.

Almost surely, 2^51908220 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 51908220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96925920).

51908220 is an abundant number, since it is smaller than the sum of its proper divisors (141943620).

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

51908220 is a wasteful number, since it uses less digits than its factorization.

51908220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204 (or 3199 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51908220 is about 7204.7359424201. The cubic root of 51908220 is about 373.0313902861.

The spelling of 51908220 in words is "fifty-one million, nine hundred eight thousand, two hundred twenty".