28380505863 has 16 divisors (see below), whose sum is σ = 38876962176. Its totient is φ = 18402550560.

The previous prime is 28380505861. The next prime is 28380505871. The reversal of 28380505863 is 36850508382.

It is not a de Polignac number, because 28380505863 - 2¹ = 28380505861 is a prime.

It is a super-2 number, since 2×28380505863² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380505861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285748 + ... + 372038.

It is an arithmetic number, because the mean of its divisors is an integer number (2429810136).

Almost surely, 2^28380505863 is an apocalyptic number.

28380505863 is a deficient number, since it is larger than the sum of its proper divisors (10496456313).

28380505863 is a wasteful number, since it uses less digits than its factorization.

28380505863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89294.

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 28380505863 in words is "twenty-eight billion, three hundred eighty million, five hundred five thousand, eight hundred sixty-three".