18435278428 has 36 divisors (see below), whose sum is σ = 39504176040. Its totient is φ = 7484998752.

The previous prime is 18435278423. The next prime is 18435278429. The reversal of 18435278428 is 82487253481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18435278423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2471475 + ... + 2478922.

Almost surely, 2^18435278428 is an apocalyptic number.

It is an amenable number.

18435278428 is an abundant number, since it is smaller than the sum of its proper divisors (21068897612).

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

18435278428 is a wasteful number, since it uses less digits than its factorization.

18435278428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950434 (or 4950425 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 52.

The spelling of 18435278428 in words is "eighteen billion, four hundred thirty-five million, two hundred seventy-eight thousand, four hundred twenty-eight".