53657993 has 16 divisors (see below), whose sum is σ = 56888832. Its totient is φ = 50544000.

The previous prime is 53657987. The next prime is 53657999. The reversal of 53657993 is 39975635.

It is an interprime number because it is at equal distance from previous prime (53657987) and next prime (53657999).

It is a cyclic number.

It is not a de Polignac number, because 53657993 - 2⁴ = 53657977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53657999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296363 + ... + 296543.

It is an arithmetic number, because the mean of its divisors is an integer number (3555552).

Almost surely, 2^53657993 is an apocalyptic number.

It is an amenable number.

53657993 is a deficient number, since it is larger than the sum of its proper divisors (3230839).

53657993 is a wasteful number, since it uses less digits than its factorization.

53657993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416.

The product of its digits is 765450, while the sum is 47.

The square root of 53657993 is about 7325.1616364419. The cubic root of 53657993 is about 377.1766580552.

The spelling of 53657993 in words is "fifty-three million, six hundred fifty-seven thousand, nine hundred ninety-three".