623647 has 4 divisors (see below), whose sum is σ = 629280. Its totient is φ = 618016.

The previous prime is 623641. The next prime is 623653. The reversal of 623647 is 746326.

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

It is an interprime number because it is at equal distance from previous prime (623641) and next prime (623653).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623647 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 (623641) 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, 2647 + ... + 2872.

It is an arithmetic number, because the mean of its divisors is an integer number (157320).

2⁶²³⁶⁴⁷ is an apocalyptic number.

623647 is a deficient number, since it is larger than the sum of its proper divisors (5633).

623647 is a wasteful number, since it uses less digits than its factorization.

623647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5632.

The product of its digits is 6048, while the sum is 28.

The square root of 623647 is about 789.7132390938. The cubic root of 623647 is about 85.4370568283.

It can be divided in two parts, 6 and 23647, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 623647 in words is "six hundred twenty-three thousand, six hundred forty-seven".