51388375 has 32 divisors (see below), whose sum is σ = 67721472. Its totient is φ = 38880000.

The previous prime is 51388361. The next prime is 51388387. The reversal of 51388375 is 57388315.

It is not a de Polignac number, because 51388375 - 2⁷ = 51388247 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189490 + ... + 189760.

It is an arithmetic number, because the mean of its divisors is an integer number (2116296).

Almost surely, 2^51388375 is an apocalyptic number.

51388375 is a deficient number, since it is larger than the sum of its proper divisors (16333097).

51388375 is a wasteful number, since it uses less digits than its factorization.

51388375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 354 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 51388375 is about 7168.5685460906. The cubic root of 51388375 is about 371.7819447979.

It can be divided in two parts, 513 and 88375, that added together give a palindrome (88888).

The spelling of 51388375 in words is "fifty-one million, three hundred eighty-eight thousand, three hundred seventy-five".