51245644 has 12 divisors (see below), whose sum is σ = 89775504. Its totient is φ = 25595504.

The previous prime is 51245627. The next prime is 51245653. The reversal of 51245644 is 44654215.

It is a happy number.

51245644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51245644² = 5252232057949472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2272 + ... + 10375.

It is an arithmetic number, because the mean of its divisors is an integer number (7481292).

Almost surely, 2^51245644 is an apocalyptic number.

It is an amenable number.

51245644 is a deficient number, since it is larger than the sum of its proper divisors (38529860).

51245644 is a wasteful number, since it uses less digits than its factorization.

51245644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13664 (or 13662 counting only the distinct ones).

The product of its digits is 19200, while the sum is 31.

The square root of 51245644 is about 7158.6062889364. The cubic root of 51245644 is about 371.4374180198.

Adding to 51245644 its reverse (44654215), we get a palindrome (95899859).

The spelling of 51245644 in words is "fifty-one million, two hundred forty-five thousand, six hundred forty-four".