623400646 has 32 divisors (see below), whose sum is σ = 1061786880. Its totient is φ = 271908000.

The previous prime is 623400643. The next prime is 623400677. The reversal of 623400646 is 646004326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623400643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103621 + ... + 109471.

It is an arithmetic number, because the mean of its divisors is an integer number (33180840).

Almost surely, 2^623400646 is an apocalyptic number.

623400646 is a deficient number, since it is larger than the sum of its proper divisors (438386234).

623400646 is a wasteful number, since it uses less digits than its factorization.

623400646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 623400646 is about 24967.9924303097. The cubic root of 623400646 is about 854.2580552065.

The spelling of 623400646 in words is "six hundred twenty-three million, four hundred thousand, six hundred forty-six".