51844240 has 80 divisors (see below), whose sum is σ = 141026688. Its totient is φ = 17353728.

The previous prime is 51844223. The next prime is 51844241. The reversal of 51844240 is 4244815.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 51844199 and 51844208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51844241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23004 + ... + 25156.

Almost surely, 2^51844240 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 51844240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70513344).

51844240 is an abundant number, since it is smaller than the sum of its proper divisors (89182448).

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

51844240 is a wasteful number, since it uses less digits than its factorization.

51844240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216 (or 2210 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 51844240 is about 7200.2944384240. The cubic root of 51844240 is about 372.8780660745.

The spelling of 51844240 in words is "fifty-one million, eight hundred forty-four thousand, two hundred forty".