51220772 has 6 divisors (see below), whose sum is σ = 89636358. Its totient is φ = 25610384.

The previous prime is 51220769. The next prime is 51220777. The reversal of 51220772 is 27702215.

It can be written as a sum of positive squares in only one way, i.e., 50779876 + 440896 = 7126^2 + 664^2 .

It is not an unprimeable number, because it can be changed into a prime (51220777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6402593 + ... + 6402600.

It is an arithmetic number, because the mean of its divisors is an integer number (14939393).

Almost surely, 2^51220772 is an apocalyptic number.

It is an amenable number.

51220772 is a deficient number, since it is larger than the sum of its proper divisors (38415586).

51220772 is a wasteful number, since it uses less digits than its factorization.

51220772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12805197 (or 12805195 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 51220772 is about 7156.8688684368. The cubic root of 51220772 is about 371.3773160888.

Adding to 51220772 its reverse (27702215), we get a palindrome (78922987).

The spelling of 51220772 in words is "fifty-one million, two hundred twenty thousand, seven hundred seventy-two".