28031287538 has 16 divisors (see below), whose sum is σ = 43650550080. Its totient is φ = 13484520336.

The previous prime is 28031287523. The next prime is 28031287541. The reversal of 28031287538 is 83578213082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28031287492 and 28031287501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837470 + ... + 870297.

It is an arithmetic number, because the mean of its divisors is an integer number (2728159380).

Almost surely, 2^28031287538 is an apocalyptic number.

28031287538 is a deficient number, since it is larger than the sum of its proper divisors (15619262542).

28031287538 is a wasteful number, since it uses less digits than its factorization.

28031287538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708081.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 28031287538 in words is "twenty-eight billion, thirty-one million, two hundred eighty-seven thousand, five hundred thirty-eight".