28103863840 has 96 divisors (see below), whose sum is σ = 71916946416. Its totient is φ = 10316697600.

The previous prime is 28103863811. The next prime is 28103863859. The reversal of 28103863840 is 4836830182.

It can be written as a sum of positive squares in 8 ways, for example, as 18695639824 + 9408224016 = 136732^2 + 96996^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320790 + ... + 398890.

Almost surely, 2^28103863840 is an apocalyptic number.

28103863840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28103863840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35958473208).

28103863840 is an abundant number, since it is smaller than the sum of its proper divisors (43813082576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28103863840 is a wasteful number, since it uses less digits than its factorization.

28103863840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78302 (or 78294 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 28103863840 in words is "twenty-eight billion, one hundred three million, eight hundred sixty-three thousand, eight hundred forty".