51503544 has 96 divisors (see below), whose sum is σ = 145454400. Its totient is φ = 16450560.

The previous prime is 51503537. The next prime is 51503549. The reversal of 51503544 is 44530515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51503549) 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, 215377 + ... + 215615.

It is an arithmetic number, because the mean of its divisors is an integer number (1515150).

Almost surely, 2^51503544 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 51503544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72727200).

51503544 is an abundant number, since it is smaller than the sum of its proper divisors (93950856).

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

51503544 is a wasteful number, since it uses less digits than its factorization.

51503544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 51503544 is about 7176.5969651361. The cubic root of 51503544 is about 372.0594771359.

The spelling of 51503544 in words is "fifty-one million, five hundred three thousand, five hundred forty-four".