623557 has 4 divisors (see below), whose sum is σ = 680256. Its totient is φ = 566860.

The previous prime is 623537. The next prime is 623563. The reversal of 623557 is 755326.

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 a de Polignac number, because none of the positive numbers 2^k-623557 is a prime.

It is a Duffinian number.

623557 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623537) 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, 28333 + ... + 28354.

It is an arithmetic number, because the mean of its divisors is an integer number (170064).

2⁶²³⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

623557 is a deficient number, since it is larger than the sum of its proper divisors (56699).

623557 is a wasteful number, since it uses less digits than its factorization.

623557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56698.

The product of its digits is 6300, while the sum is 28.

The square root of 623557 is about 789.6562543284. The cubic root of 623557 is about 85.4329467548.

Subtracting 623557 from its reverse (755326), we obtain a square (131769 = 363²).

The spelling of 623557 in words is "six hundred twenty-three thousand, five hundred fifty-seven".