51366216 has 32 divisors (see below), whose sum is σ = 140090400. Its totient is φ = 15565440.

The previous prime is 51366181. The next prime is 51366229. The reversal of 51366216 is 61266315.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97021 + ... + 97548.

It is an arithmetic number, because the mean of its divisors is an integer number (4377825).

Almost surely, 2^51366216 is an apocalyptic number.

It is an amenable number.

51366216 is an abundant number, since it is smaller than the sum of its proper divisors (88724184).

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

51366216 is a wasteful number, since it uses less digits than its factorization.

51366216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194589 (or 194585 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 51366216 is about 7167.0228128561. The cubic root of 51366216 is about 371.7284988545.

Subtracting 51366216 from its reverse (61266315), we obtain a palindrome (9900099).

The spelling of 51366216 in words is "fifty-one million, three hundred sixty-six thousand, two hundred sixteen".