19871897028 has 24 divisors (see below), whose sum is σ = 46386684960. Its totient is φ = 6621262080.

The previous prime is 19871897027. The next prime is 19871897051. The reversal of 19871897028 is 82079817891.

It is not an unprimeable number, because it can be changed into a prime (19871897027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307213 + ... + 366228.

It is an arithmetic number, because the mean of its divisors is an integer number (1932778540).

Almost surely, 2^19871897028 is an apocalyptic number.

It is an amenable number.

19871897028 is an abundant number, since it is smaller than the sum of its proper divisors (26514787932).

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

19871897028 is a wasteful number, since it uses less digits than its factorization.

19871897028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675907 (or 675905 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 60.

The spelling of 19871897028 in words is "nineteen billion, eight hundred seventy-one million, eight hundred ninety-seven thousand, twenty-eight".