51620022 has 48 divisors (see below), whose sum is σ = 117012480. Its totient is φ = 16426800.

The previous prime is 51620021. The next prime is 51620033. The reversal of 51620022 is 22002615.

51620022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 51619977 and 51620004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51620021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43497 + ... + 44667.

It is an arithmetic number, because the mean of its divisors is an integer number (2437760).

Almost surely, 2^51620022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51620022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58506240).

51620022 is an abundant number, since it is smaller than the sum of its proper divisors (65392458).

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

51620022 is a wasteful number, since it uses less digits than its factorization.

51620022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289 (or 1286 counting only the distinct ones).

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

The square root of 51620022 is about 7184.7075097042. The cubic root of 51620022 is about 372.3397433852.

Adding to 51620022 its reverse (22002615), we get a palindrome (73622637).

The spelling of 51620022 in words is "fifty-one million, six hundred twenty thousand, twenty-two".