51322572 has 144 divisors (see below), whose sum is σ = 162256640. Its totient is φ = 13856832.

The previous prime is 51322571. The next prime is 51322573. The reversal of 51322572 is 27522315.

It is an interprime number because it is at equal distance from previous prime (51322571) and next prime (51322573).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51322571) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129078 + ... + 129474.

Almost surely, 2^51322572 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 51322572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81128320).

51322572 is an abundant number, since it is smaller than the sum of its proper divisors (110934068).

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

51322572 is a wasteful number, since it uses less digits than its factorization.

51322572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 428 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 51322572 is about 7163.9773868990. The cubic root of 51322572 is about 371.6231876407.

Adding to 51322572 its reverse (27522315), we get a palindrome (78844887).

The spelling of 51322572 in words is "fifty-one million, three hundred twenty-two thousand, five hundred seventy-two".