51887889 has 12 divisors (see below), whose sum is σ = 75976836. Its totient is φ = 34117632.

The previous prime is 51887867. The next prime is 51887897. The reversal of 51887889 is 98878815.

It can be written as a sum of positive squares in 2 ways, for example, as 44997264 + 6890625 = 6708^2 + 2625^2 .

It is not a de Polignac number, because 51887889 - 2¹⁵ = 51855121 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51887809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38832 + ... + 40145.

It is an arithmetic number, because the mean of its divisors is an integer number (6331403).

Almost surely, 2^51887889 is an apocalyptic number.

It is an amenable number.

51887889 is a deficient number, since it is larger than the sum of its proper divisors (24088947).

51887889 is a wasteful number, since it uses less digits than its factorization.

51887889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79056 (or 79053 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 54.

The square root of 51887889 is about 7203.3248573142. The cubic root of 51887889 is about 372.9826819340.

The spelling of 51887889 in words is "fifty-one million, eight hundred eighty-seven thousand, eight hundred eighty-nine".