51864020 has 48 divisors (see below), whose sum is σ = 120046080. Its totient is φ = 18700416.

The previous prime is 51864019. The next prime is 51864041. The reversal of 51864020 is 2046815.

51864020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8861 + ... + 13499.

It is an arithmetic number, because the mean of its divisors is an integer number (2500960).

Almost surely, 2^51864020 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 51864020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60023040).

51864020 is an abundant number, since it is smaller than the sum of its proper divisors (68182060).

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

51864020 is a wasteful number, since it uses less digits than its factorization.

51864020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704 (or 4702 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 51864020 is about 7201.6678623774. The cubic root of 51864020 is about 372.9254811159.

The spelling of 51864020 in words is "fifty-one million, eight hundred sixty-four thousand, twenty".