51822840 has 32 divisors (see below), whose sum is σ = 155468880. Its totient is φ = 13819392.

The previous prime is 51822833. The next prime is 51822847. The reversal of 51822840 is 4822815.

It is an interprime number because it is at equal distance from previous prime (51822833) and next prime (51822847).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51822798 and 51822807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51822847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215809 + ... + 216048.

Almost surely, 2^51822840 is an apocalyptic number.

It is an amenable number.

51822840 is an abundant number, since it is smaller than the sum of its proper divisors (103646040).

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

51822840 is a wasteful number, since it uses less digits than its factorization.

51822840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431871 (or 431867 counting only the distinct ones).

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

The square root of 51822840 is about 7198.8082347011. The cubic root of 51822840 is about 372.8267541140.

The spelling of 51822840 in words is "fifty-one million, eight hundred twenty-two thousand, eight hundred forty".