51022620 has 144 divisors (see below), whose sum is σ = 171636192. Its totient is φ = 12165120.

The previous prime is 51022607. The next prime is 51022637. The reversal of 51022620 is 2622015.

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 = 51022593 and 51022602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144364 + ... + 144716.

It is an arithmetic number, because the mean of its divisors is an integer number (1191918).

Almost surely, 2^51022620 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 51022620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85818096).

51022620 is an abundant number, since it is smaller than the sum of its proper divisors (120613572).

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

51022620 is a wasteful number, since it uses less digits than its factorization.

51022620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51022620 is about 7143.0119697506. The cubic root of 51022620 is about 370.8977954120.

Adding to 51022620 its reverse (2622015), we get a palindrome (53644635).

The spelling of 51022620 in words is "fifty-one million, twenty-two thousand, six hundred twenty".