51842780 has 48 divisors (see below), whose sum is σ = 120476160. Its totient is φ = 18580800.

The previous prime is 51842771. The next prime is 51842801. The reversal of 51842780 is 8724815.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51842780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13961 + ... + 17279.

It is an arithmetic number, because the mean of its divisors is an integer number (2509920).

Almost surely, 2^51842780 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 51842780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60238080).

51842780 is an abundant number, since it is smaller than the sum of its proper divisors (68633380).

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

51842780 is a wasteful number, since it uses less digits than its factorization.

51842780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410 (or 3408 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 51842780 is about 7200.1930529674. The cubic root of 51842780 is about 372.8745658009.

The spelling of 51842780 in words is "fifty-one million, eight hundred forty-two thousand, seven hundred eighty".