51020864 has 14 divisors (see below), whose sum is σ = 101244654. Its totient is φ = 25510400.

The previous prime is 51020863. The next prime is 51020867. The reversal of 51020864 is 46802015.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 1459264 = 7040^2 + 1208^2 .

It is not an unprimeable number, because it can be changed into a prime (51020861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 398537 + ... + 398664.

It is an arithmetic number, because the mean of its divisors is an integer number (7231761).

Almost surely, 2^51020864 is an apocalyptic number.

It is an amenable number.

51020864 is a deficient number, since it is larger than the sum of its proper divisors (50223790).

51020864 is an equidigital number, since it uses as much as digits as its factorization.

51020864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797213 (or 797203 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 51020864 is about 7142.8890513573. The cubic root of 51020864 is about 370.8935404103.

Adding to 51020864 its reverse (46802015), we get a palindrome (97822879).

The spelling of 51020864 in words is "fifty-one million, twenty thousand, eight hundred sixty-four".