623978 has 8 divisors (see below), whose sum is σ = 945540. Its totient is φ = 308800.

The previous prime is 623977. The next prime is 623983. The reversal of 623978 is 879326.

It can be written as a sum of positive squares in 2 ways, for example, as 458329 + 165649 = 677^2 + 407^2 .

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

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (623977) 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, 1343 + ... + 1746.

2⁶²³⁹⁷⁸ is an apocalyptic number.

623978 is a deficient number, since it is larger than the sum of its proper divisors (321562).

623978 is a wasteful number, since it uses less digits than its factorization.

623978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192.

The product of its digits is 18144, while the sum is 35.

The square root of 623978 is about 789.9227810362. The cubic root of 623978 is about 85.4521693648.

The spelling of 623978 in words is "six hundred twenty-three thousand, nine hundred seventy-eight".