51222738 has 48 divisors (see below), whose sum is σ = 121232160. Its totient is φ = 14382144.

The previous prime is 51222733. The next prime is 51222767. The reversal of 51222738 is 83722215.

It is not an unprimeable number, because it can be changed into a prime (51222733) 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, 15870 + ... + 18822.

It is an arithmetic number, because the mean of its divisors is an integer number (2525670).

Almost surely, 2^51222738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51222738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60616080).

51222738 is an abundant number, since it is smaller than the sum of its proper divisors (70009422).

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

51222738 is a wasteful number, since it uses less digits than its factorization.

51222738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031 (or 3024 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 51222738 is about 7157.0062176863. The cubic root of 51222738 is about 371.3820675365.

The spelling of 51222738 in words is "fifty-one million, two hundred twenty-two thousand, seven hundred thirty-eight".