18428728429 has 4 divisors (see below), whose sum is σ = 18444467200. Its totient is φ = 18412989660.

The previous prime is 18428728363. The next prime is 18428728447. The reversal of 18428728429 is 92482782481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18428728429 - 2⁷ = 18428728301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18428728429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428728489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7867629 + ... + 7869970.

It is an arithmetic number, because the mean of its divisors is an integer number (4611116800).

Almost surely, 2^18428728429 is an apocalyptic number.

It is an amenable number.

18428728429 is a deficient number, since it is larger than the sum of its proper divisors (15738771).

18428728429 is a wasteful number, since it uses less digits than its factorization.

18428728429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15738770.

The product of its digits is 4128768, while the sum is 55.

The spelling of 18428728429 in words is "eighteen billion, four hundred twenty-eight million, seven hundred twenty-eight thousand, four hundred twenty-nine".