51693216 has 24 divisors (see below), whose sum is σ = 135694944. Its totient is φ = 17231040.

The previous prime is 51693211. The next prime is 51693221. The reversal of 51693216 is 61239615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51693211) and next prime (51693221).

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51693211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269140 + ... + 269331.

It is an arithmetic number, because the mean of its divisors is an integer number (5653956).

Almost surely, 2^51693216 is an apocalyptic number.

It is an amenable number.

51693216 is an abundant number, since it is smaller than the sum of its proper divisors (84001728).

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

51693216 is a wasteful number, since it uses less digits than its factorization.

51693216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538484 (or 538476 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 51693216 is about 7189.7994408746. The cubic root of 51693216 is about 372.5156451847.

It can be divided in two parts, 5169 and 3216, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 51693216 in words is "fifty-one million, six hundred ninety-three thousand, two hundred sixteen".