51722220 has 48 divisors (see below), whose sum is σ = 157989888. Its totient is φ = 12538560.

The previous prime is 51722213. The next prime is 51722233. The reversal of 51722220 is 2222715.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38524 + ... + 39843.

It is an arithmetic number, because the mean of its divisors is an integer number (3291456).

Almost surely, 2^51722220 is an apocalyptic number.

It is an amenable number.

51722220 is an abundant number, since it is smaller than the sum of its proper divisors (106267668).

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

51722220 is a wasteful number, since it uses less digits than its factorization.

51722220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78390 (or 78388 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 51722220 is about 7191.8161823005. The cubic root of 51722220 is about 372.5853024468.

Adding to 51722220 its reverse (2222715), we get a palindrome (53944935).

The spelling of 51722220 in words is "fifty-one million, seven hundred twenty-two thousand, two hundred twenty".