51858240 has 112 divisors (see below), whose sum is σ = 188195712. Its totient is φ = 11851776.

The previous prime is 51858229. The next prime is 51858241. The reversal of 51858240 is 4285815.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51858241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2862 + ... + 10578.

Almost surely, 2^51858240 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 51858240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94097856).

51858240 is an abundant number, since it is smaller than the sum of its proper divisors (136337472).

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

51858240 is a wasteful number, since it uses less digits than its factorization.

51858240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7744 (or 7734 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 51858240 is about 7201.2665552665. The cubic root of 51858240 is about 372.9116270069.

The spelling of 51858240 in words is "fifty-one million, eight hundred fifty-eight thousand, two hundred forty".