51683550 has 48 divisors (see below), whose sum is σ = 130920192. Its totient is φ = 13487200.

The previous prime is 51683543. The next prime is 51683557. The reversal of 51683550 is 5538615.

It is an interprime number because it is at equal distance from previous prime (51683543) and next prime (51683557).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51683557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3385 + ... + 10715.

It is an arithmetic number, because the mean of its divisors is an integer number (2727504).

Almost surely, 2^51683550 is an apocalyptic number.

51683550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51683550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65460096).

51683550 is an abundant number, since it is smaller than the sum of its proper divisors (79236642).

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

51683550 is a wasteful number, since it uses less digits than its factorization.

51683550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7393 (or 7388 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 51683550 is about 7189.1272071094. The cubic root of 51683550 is about 372.4924251121.

The spelling of 51683550 in words is "fifty-one million, six hundred eighty-three thousand, five hundred fifty".