51533856 has 72 divisors (see below), whose sum is σ = 159881904. Its totient is φ = 15615360.

The previous prime is 51533803. The next prime is 51533879. The reversal of 51533856 is 65833515.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51533856.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4966 + ... + 11301.

It is an arithmetic number, because the mean of its divisors is an integer number (2220582).

Almost surely, 2^51533856 is an apocalyptic number.

It is an amenable number.

51533856 is an abundant number, since it is smaller than the sum of its proper divisors (108348048).

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

51533856 is a wasteful number, since it uses less digits than its factorization.

51533856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16294 (or 16283 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 51533856 is about 7178.7085189468. The cubic root of 51533856 is about 372.1324537003.

It can be divided in two parts, 5153 and 3856, that added together give a palindrome (9009).

The spelling of 51533856 in words is "fifty-one million, five hundred thirty-three thousand, eight hundred fifty-six".