28919170623 has 32 divisors (see below), whose sum is σ = 44410407424. Its totient is φ = 16396877952.

The previous prime is 28919170619. The next prime is 28919170627. The reversal of 28919170623 is 32607191982.

It is an interprime number because it is at equal distance from previous prime (28919170619) and next prime (28919170627).

It is not a de Polignac number, because 28919170623 - 2² = 28919170619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919170627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2490036 + ... + 2501622.

It is an arithmetic number, because the mean of its divisors is an integer number (1387825232).

Almost surely, 2^28919170623 is an apocalyptic number.

28919170623 is a deficient number, since it is larger than the sum of its proper divisors (15491236801).

28919170623 is a wasteful number, since it uses less digits than its factorization.

28919170623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12511.

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 28919170623 in words is "twenty-eight billion, nine hundred nineteen million, one hundred seventy thousand, six hundred twenty-three".