53785813 has 4 divisors (see below), whose sum is σ = 54930240. Its totient is φ = 52641388.

The previous prime is 53785811. The next prime is 53785817. The reversal of 53785813 is 31858735.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53785813 - 2¹ = 53785811 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53785811) 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, 572143 + ... + 572236.

It is an arithmetic number, because the mean of its divisors is an integer number (13732560).

Almost surely, 2^53785813 is an apocalyptic number.

It is an amenable number.

53785813 is a deficient number, since it is larger than the sum of its proper divisors (1144427).

53785813 is a wasteful number, since it uses less digits than its factorization.

53785813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144426.

The product of its digits is 100800, while the sum is 40.

The square root of 53785813 is about 7333.8811689310. The cubic root of 53785813 is about 377.4759144319.

The spelling of 53785813 in words is "fifty-three million, seven hundred eighty-five thousand, eight hundred thirteen".