51863616 has 168 divisors, whose sum is σ = 179100480. Its totient is φ = 14017536.

The previous prime is 51863611. The next prime is 51863657. The reversal of 51863616 is 61636815.

It is a happy number.

51863616 is a `hidden beast` number, since 5 + 1 + 8 + 636 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

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

It is not an unprimeable number, because it can be changed into a prime (51863611) 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, 76270 + ... + 76946.

Almost surely, 2^51863616 is an apocalyptic number.

51863616 is a gapful number since it is divisible by the number (56) 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 51863616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89550240).

51863616 is an abundant number, since it is smaller than the sum of its proper divisors (127236864).

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

51863616 is a wasteful number, since it uses less digits than its factorization.

51863616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 708 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 51863616 is about 7201.6398132648. The cubic root of 51863616 is about 372.9245127999.

The spelling of 51863616 in words is "fifty-one million, eight hundred sixty-three thousand, six hundred sixteen".