51869808 has 70 divisors (see below), whose sum is σ = 150711584. Its totient is φ = 17286048.

The previous prime is 51869803. The next prime is 51869809. The reversal of 51869808 is 80896815.

51869808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51869801) by changing a digit.

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 13 ways as a sum of consecutive naturals, for example, 9441 + ... + 13887.

Almost surely, 2^51869808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51869808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75355792).

51869808 is an abundant number, since it is smaller than the sum of its proper divisors (98841776).

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

51869808 is an equidigital number, since it uses as much as digits as its factorization.

51869808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473 (or 4452 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 51869808 is about 7202.0697025230. The cubic root of 51869808 is about 372.9393533688.

The spelling of 51869808 in words is "fifty-one million, eight hundred sixty-nine thousand, eight hundred eight".