51216616 has 32 divisors (see below), whose sum is σ = 105091200. Its totient is φ = 23207040.

The previous prime is 51216611. The next prime is 51216617. The reversal of 51216616 is 61661215.

It is not an unprimeable number, because it can be changed into a prime (51216611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35281 + ... + 36703.

It is an arithmetic number, because the mean of its divisors is an integer number (3284100).

Almost surely, 2^51216616 is an apocalyptic number.

It is an amenable number.

51216616 is an abundant number, since it is smaller than the sum of its proper divisors (53874584).

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

51216616 is a wasteful number, since it uses less digits than its factorization.

51216616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849 (or 1845 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 51216616 is about 7156.5785121104. The cubic root of 51216616 is about 371.3672714278.

The spelling of 51216616 in words is "fifty-one million, two hundred sixteen thousand, six hundred sixteen".