623649 has 8 divisors (see below), whose sum is σ = 895552. Its totient is φ = 383760.

The previous prime is 623641. The next prime is 623653. The reversal of 623649 is 946326.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 623649 - 2³ = 623641 is a prime.

It is a Duffinian number.

623649 is a lucky number.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 623649.

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 7 ways as a sum of consecutive naturals, for example, 7957 + ... + 8034.

It is an arithmetic number, because the mean of its divisors is an integer number (111944).

2⁶²³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

623649 is a deficient number, since it is larger than the sum of its proper divisors (271903).

623649 is a wasteful number, since it uses less digits than its factorization.

623649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16007.

The product of its digits is 7776, while the sum is 30.

The square root of 623649 is about 789.7145053752. The cubic root of 623649 is about 85.4371481587.

The spelling of 623649 in words is "six hundred twenty-three thousand, six hundred forty-nine".