51630216 has 96 divisors (see below), whose sum is σ = 148236480. Its totient is φ = 14945920.

The previous prime is 51630211. The next prime is 51630253. The reversal of 51630216 is 61203615.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51630211) 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, 66406 + ... + 67178.

It is an arithmetic number, because the mean of its divisors is an integer number (1544130).

Almost surely, 2^51630216 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 51630216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74118240).

51630216 is an abundant number, since it is smaller than the sum of its proper divisors (96606264).

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

51630216 is a wasteful number, since it uses less digits than its factorization.

51630216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 51630216 is about 7185.4168981347. The cubic root of 51630216 is about 372.3642518438.

The spelling of 51630216 in words is "fifty-one million, six hundred thirty thousand, two hundred sixteen".