53768991 has 4 divisors (see below), whose sum is σ = 71691992. Its totient is φ = 35845992.

The previous prime is 53768989. The next prime is 53769007. The reversal of 53768991 is 19986735.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 53768991 - 2¹ = 53768989 is a prime.

It is a super-2 number, since 2×53768991² = 5782208786316162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53768991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53768941) 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, 8961496 + ... + 8961501.

It is an arithmetic number, because the mean of its divisors is an integer number (17922998).

Almost surely, 2^53768991 is an apocalyptic number.

53768991 is a deficient number, since it is larger than the sum of its proper divisors (17923001).

53768991 is a wasteful number, since it uses less digits than its factorization.

53768991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17923000.

The product of its digits is 408240, while the sum is 48.

The square root of 53768991 is about 7332.7342103747. The cubic root of 53768991 is about 377.4365573252.

The spelling of 53768991 in words is "fifty-three million, seven hundred sixty-eight thousand, nine hundred ninety-one".