51550722 has 48 divisors (see below), whose sum is σ = 118013280. Its totient is φ = 16671312.

The previous prime is 51550721. The next prime is 51550789. The reversal of 51550722 is 22705515.

It is a happy number.

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 (51550721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345904 + ... + 346052.

It is an arithmetic number, because the mean of its divisors is an integer number (2458610).

Almost surely, 2^51550722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51550722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59006640).

51550722 is an abundant number, since it is smaller than the sum of its proper divisors (66462558).

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

51550722 is a wasteful number, since it uses less digits than its factorization.

51550722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 51550722 is about 7179.8831466814. The cubic root of 51550722 is about 372.1730464411.

The spelling of 51550722 in words is "fifty-one million, five hundred fifty thousand, seven hundred twenty-two".