51840558 has 96 divisors (see below), whose sum is σ = 141702912. Its totient is φ = 13305600.

The previous prime is 51840557. The next prime is 51840559. The reversal of 51840558 is 85504815.

It is an interprime number because it is at equal distance from previous prime (51840557) and next prime (51840559).

It is a super-3 number, since 3×51840558³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51840553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156453 + ... + 156783.

It is an arithmetic number, because the mean of its divisors is an integer number (1476072).

Almost surely, 2^51840558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51840558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70851456).

51840558 is an abundant number, since it is smaller than the sum of its proper divisors (89862354).

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

51840558 is a wasteful number, since it uses less digits than its factorization.

51840558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 51840558 is about 7200.0387498957. The cubic root of 51840558 is about 372.8692385459.

The spelling of 51840558 in words is "fifty-one million, eight hundred forty thousand, five hundred fifty-eight".