51022720 has 96 divisors (see below), whose sum is σ = 141977880. Its totient is φ = 17482752.

The previous prime is 51022691. The next prime is 51022739. The reversal of 51022720 is 2722015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30547 + ... + 32173.

Almost surely, 2^51022720 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 51022720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70988940).

51022720 is an abundant number, since it is smaller than the sum of its proper divisors (90955160).

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

51022720 is a wasteful number, since it uses less digits than its factorization.

51022720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660 (or 1641 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 51022720 is about 7143.0189695954. The cubic root of 51022720 is about 370.8980377212.

Adding to 51022720 its reverse (2722015), we get a palindrome (53744735).

The spelling of 51022720 in words is "fifty-one million, twenty-two thousand, seven hundred twenty".