623778 has 8 divisors (see below), whose sum is σ = 1247568. Its totient is φ = 207924.

The previous prime is 623771. The next prime is 623803. The reversal of 623778 is 877326.

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

623778 is an admirable number.

It is a Curzon number.

It is a plaindrome in base 13 and base 14.

It is not an unprimeable number, because it can be changed into a prime (623771) by changing a digit.

623778 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51976 + ... + 51987.

It is an arithmetic number, because the mean of its divisors is an integer number (155946).

2⁶²³⁷⁷⁸ is an apocalyptic number.

623778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

623778 is a wasteful number, since it uses less digits than its factorization.

623778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103968.

The product of its digits is 14112, while the sum is 33.

The square root of 623778 is about 789.7961762379. The cubic root of 623778 is about 85.4430385620.

The spelling of 623778 in words is "six hundred twenty-three thousand, seven hundred seventy-eight".