51539400 has 288 divisors, whose sum is σ = 200210400. Its totient is φ = 11750400.

The previous prime is 51539399. The next prime is 51539407. The reversal of 51539400 is 493515.

It is not an unprimeable number, because it can be changed into a prime (51539407) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 376132 + ... + 376268.

It is an arithmetic number, because the mean of its divisors is an integer number (695175).

Almost surely, 2^51539400 is an apocalyptic number.

51539400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51539400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100105200).

51539400 is an abundant number, since it is smaller than the sum of its proper divisors (148671000).

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

51539400 is a wasteful number, since it uses less digits than its factorization.

51539400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 51539400 is about 7179.0946504417. The cubic root of 51539400 is about 372.1457978622.

The spelling of 51539400 in words is "fifty-one million, five hundred thirty-nine thousand, four hundred".