53257687 has 4 divisors (see below), whose sum is σ = 60865936. Its totient is φ = 45649440.

The previous prime is 53257681. The next prime is 53257709. The reversal of 53257687 is 78675235.

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

It is a cyclic number.

It is not a de Polignac number, because 53257687 - 2³ = 53257679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53257681) 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, 3804114 + ... + 3804127.

It is an arithmetic number, because the mean of its divisors is an integer number (15216484).

Almost surely, 2^53257687 is an apocalyptic number.

53257687 is a deficient number, since it is larger than the sum of its proper divisors (7608249).

53257687 is an equidigital number, since it uses as much as digits as its factorization.

53257687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7608248.

The product of its digits is 352800, while the sum is 43.

The square root of 53257687 is about 7297.7864452175. The cubic root of 53257687 is about 376.2363625333.

The spelling of 53257687 in words is "fifty-three million, two hundred fifty-seven thousand, six hundred eighty-seven".