1623640856 has 16 divisors (see below), whose sum is σ = 3044767200. Its totient is φ = 811702944.

The previous prime is 1623640853. The next prime is 1623640861. The reversal of 1623640856 is 6580463261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623640853) 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 3 ways as a sum of consecutive naturals, for example, 79826 + ... + 98078.

It is an arithmetic number, because the mean of its divisors is an integer number (190297950).

Almost surely, 2^1623640856 is an apocalyptic number.

It is an amenable number.

1623640856 is a deficient number, since it is larger than the sum of its proper divisors (1421126344).

1623640856 is a wasteful number, since it uses less digits than its factorization.

1623640856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29378 (or 29374 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 1623640856 is about 40294.4271084725. The cubic root of 1623640856 is about 1175.3394778262.

The spelling of 1623640856 in words is "one billion, six hundred twenty-three million, six hundred forty thousand, eight hundred fifty-six".