18987807860 has 48 divisors (see below), whose sum is σ = 45580394496. Its totient is φ = 6508726272.

The previous prime is 18987807857. The next prime is 18987807869. The reversal of 18987807860 is 6870878981.

It is a junction number, because it is equal to n+sod(n) for n = 18987807793 and 18987807802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987807869) 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, 822029 + ... + 844811.

It is an arithmetic number, because the mean of its divisors is an integer number (949591552).

Almost surely, 2^18987807860 is an apocalyptic number.

18987807860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18987807860 is an abundant number, since it is smaller than the sum of its proper divisors (26592586636).

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

18987807860 is a wasteful number, since it uses less digits than its factorization.

18987807860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28752 (or 28750 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 62.

The spelling of 18987807860 in words is "eighteen billion, nine hundred eighty-seven million, eight hundred seven thousand, eight hundred sixty".