51822420 has 144 divisors (see below), whose sum is σ = 163887360. Its totient is φ = 12160512.

The previous prime is 51822413. The next prime is 51822431. The reversal of 51822420 is 2422815.

It is a congruent number.

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, 655941 + ... + 656019.

Almost surely, 2^51822420 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 51822420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81943680).

51822420 is an abundant number, since it is smaller than the sum of its proper divisors (112064940).

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

51822420 is a wasteful number, since it uses less digits than its factorization.

51822420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 51822420 is about 7198.7790631468. The cubic root of 51822420 is about 372.8257469155.

The spelling of 51822420 in words is "fifty-one million, eight hundred twenty-two thousand, four hundred twenty".