51808242 has 32 divisors (see below), whose sum is σ = 106235712. Its totient is φ = 16837184.

The previous prime is 51808217. The next prime is 51808247. The reversal of 51808242 is 24280815.

It is not an unprimeable number, because it can be changed into a prime (51808247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62233 + ... + 63059.

It is an arithmetic number, because the mean of its divisors is an integer number (3319866).

Almost surely, 2^51808242 is an apocalyptic number.

51808242 is an abundant number, since it is smaller than the sum of its proper divisors (54427470).

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

51808242 is a wasteful number, since it uses less digits than its factorization.

51808242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 51808242 is about 7197.7942454616. The cubic root of 51808242 is about 372.7917435789.

The spelling of 51808242 in words is "fifty-one million, eight hundred eight thousand, two hundred forty-two".