51399744 has 56 divisors (see below), whose sum is σ = 148364448. Its totient is φ = 15575040.

The previous prime is 51399709. The next prime is 51399763. The reversal of 51399744 is 44799315.

It is a junction number, because it is equal to n+sod(n) for n = 51399696 and 51399705.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 10057 + ... + 14280.

Almost surely, 2^51399744 is an apocalyptic number.

It is an amenable number.

51399744 is an abundant number, since it is smaller than the sum of its proper divisors (96964704).

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

51399744 is a wasteful number, since it uses less digits than its factorization.

51399744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24363 (or 24353 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 51399744 is about 7169.3614778445. The cubic root of 51399744 is about 371.8093600597.

The spelling of 51399744 in words is "fifty-one million, three hundred ninety-nine thousand, seven hundred forty-four".