51220272 has 30 divisors (see below), whose sum is σ = 132447252. Its totient is φ = 17056896.

The previous prime is 51220223. The next prime is 51220291. The reversal of 51220272 is 27202215.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49068 + ... + 50100.

Almost surely, 2^51220272 is an apocalyptic number.

It is an amenable number.

51220272 is an abundant number, since it is smaller than the sum of its proper divisors (81226980).

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

51220272 is an equidigital number, since it uses as much as digits as its factorization.

51220272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 1038 counting only the distinct ones).

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

The square root of 51220272 is about 7156.8339368746. The cubic root of 51220272 is about 371.3761076646.

Adding to 51220272 its reverse (27202215), we get a palindrome (78422487).

The spelling of 51220272 in words is "fifty-one million, two hundred twenty thousand, two hundred seventy-two".