53991368 has 16 divisors (see below), whose sum is σ = 102237660. Its totient is φ = 26728000.

The previous prime is 53991361. The next prime is 53991401. The reversal of 53991368 is 86319935.

It can be written as a sum of positive squares in 2 ways, for example, as 53553124 + 438244 = 7318^2 + 662^2 .

It is a super-2 number, since 2×53991368² = 5830135637022848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (53991361) 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, 32603 + ... + 34218.

Almost surely, 2^53991368 is an apocalyptic number.

It is an amenable number.

53991368 is a deficient number, since it is larger than the sum of its proper divisors (48246292).

53991368 is a wasteful number, since it uses less digits than its factorization.

53991368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66928 (or 66924 counting only the distinct ones).

The product of its digits is 174960, while the sum is 44.

The square root of 53991368 is about 7347.8818716689. The cubic root of 53991368 is about 377.9561738239.

The spelling of 53991368 in words is "fifty-three million, nine hundred ninety-one thousand, three hundred sixty-eight".