53257657 has 4 divisors (see below), whose sum is σ = 53664336. Its totient is φ = 52850980.

The previous prime is 53257643. The next prime is 53257669. The reversal of 53257657 is 75675235.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75675235 = 5 ⋅15135047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53257657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53257357) 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, 203143 + ... + 203404.

It is an arithmetic number, because the mean of its divisors is an integer number (13416084).

Almost surely, 2^53257657 is an apocalyptic number.

It is an amenable number.

53257657 is a deficient number, since it is larger than the sum of its proper divisors (406679).

53257657 is a wasteful number, since it uses less digits than its factorization.

53257657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406678.

The product of its digits is 220500, while the sum is 40.

The square root of 53257657 is about 7297.7843897994. The cubic root of 53257657 is about 376.2362918888.

The spelling of 53257657 in words is "fifty-three million, two hundred fifty-seven thousand, six hundred fifty-seven".