888728789 has 12 divisors (see below), whose sum is σ = 983678724. Its totient is φ = 798177024.

The previous prime is 888728767. The next prime is 888728807. The reversal of 888728789 is 987827888.

It can be written as a sum of positive squares in 6 ways, for example, as 10080625 + 878648164 = 3175^2 + 29642^2 .

It is a de Polignac number, because none of the positive numbers 2^k-888728789 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 (888728719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7172 + ... + 42765.

It is an arithmetic number, because the mean of its divisors is an integer number (81973227).

Almost surely, 2^888728789 is an apocalyptic number.

It is an amenable number.

888728789 is a deficient number, since it is larger than the sum of its proper divisors (94949935).

888728789 is a wasteful number, since it uses less digits than its factorization.

888728789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50024 (or 49987 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 65.

The square root of 888728789 is about 29811.5546223272. The cubic root of 888728789 is about 961.4419840732.

Subtracting 888728789 from its reverse (987827888), we obtain a palindrome (99099099).

The spelling of 888728789 in words is "eight hundred eighty-eight million, seven hundred twenty-eight thousand, seven hundred eighty-nine".