28014019638 has 32 divisors (see below), whose sum is σ = 61195882752. Its totient is φ = 8478765600.

The previous prime is 28014019567. The next prime is 28014019639. The reversal of 28014019638 is 83691041082.

It is a self number, because there is not a number n which added to its sum of digits gives 28014019638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28014019639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203553 + ... + 312188.

It is an arithmetic number, because the mean of its divisors is an integer number (1912371336).

Almost surely, 2^28014019638 is an apocalyptic number.

28014019638 is an abundant number, since it is smaller than the sum of its proper divisors (33181863114).

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

28014019638 is a wasteful number, since it uses less digits than its factorization.

28014019638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516580.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 28014019638 in words is "twenty-eight billion, fourteen million, nineteen thousand, six hundred thirty-eight".