28154644617 has 32 divisors (see below), whose sum is σ = 42102552960. Its totient is φ = 16585067520.

The previous prime is 28154644613. The next prime is 28154644621. The reversal of 28154644617 is 71644645182.

It is an interprime number because it is at equal distance from previous prime (28154644613) and next prime (28154644621).

It is not a de Polignac number, because 28154644617 - 2² = 28154644613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28154644613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1220563 + ... + 1243415.

It is an arithmetic number, because the mean of its divisors is an integer number (1315704780).

Almost surely, 2^28154644617 is an apocalyptic number.

It is an amenable number.

28154644617 is a deficient number, since it is larger than the sum of its proper divisors (13947908343).

28154644617 is a wasteful number, since it uses less digits than its factorization.

28154644617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23913.

The product of its digits is 1290240, while the sum is 48.

The spelling of 28154644617 in words is "twenty-eight billion, one hundred fifty-four million, six hundred forty-four thousand, six hundred seventeen".