18878021740 has 24 divisors (see below), whose sum is σ = 40007555280. Its totient is φ = 7481930688.

The previous prime is 18878021737. The next prime is 18878021839. The reversal of 18878021740 is 4712087881.

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, 4327642 + ... + 4332001.

It is an arithmetic number, because the mean of its divisors is an integer number (1666981470).

Almost surely, 2^18878021740 is an apocalyptic number.

18878021740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18878021740 is an abundant number, since it is smaller than the sum of its proper divisors (21129533540).

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

18878021740 is a wasteful number, since it uses less digits than its factorization.

18878021740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8659761 (or 8659759 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 46.

The spelling of 18878021740 in words is "eighteen billion, eight hundred seventy-eight million, twenty-one thousand, seven hundred forty".