51755616 has 216 divisors, whose sum is σ = 175665672. Its totient is φ = 14284800.

The previous prime is 51755581. The next prime is 51755621. The reversal of 51755616 is 61655715.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1669521 + ... + 1669551.

It is an arithmetic number, because the mean of its divisors is an integer number (813267).

Almost surely, 2^51755616 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 51755616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87832836).

51755616 is an abundant number, since it is smaller than the sum of its proper divisors (123910056).

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

51755616 is a wasteful number, since it uses less digits than its factorization.

51755616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 64 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 51755616 is about 7194.1376133627. The cubic root of 51755616 is about 372.6654754793.

Subtracting 51755616 from its reverse (61655715), we obtain a palindrome (9900099).

The spelling of 51755616 in words is "fifty-one million, seven hundred fifty-five thousand, six hundred sixteen".