28402742218 has 8 divisors (see below), whose sum is σ = 42790158180. Its totient is φ = 14139356160.

The previous prime is 28402742209. The next prime is 28402742279. The reversal of 28402742218 is 81224720482.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19344080889 + 9058661329 = 139083^2 + 95177^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31006903 + ... + 31007818.

Almost surely, 2^28402742218 is an apocalyptic number.

28402742218 is a deficient number, since it is larger than the sum of its proper divisors (14387415962).

28402742218 is a wasteful number, since it uses less digits than its factorization.

28402742218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62014952.

The product of its (nonzero) digits is 114688, while the sum is 40.

The spelling of 28402742218 in words is "twenty-eight billion, four hundred two million, seven hundred forty-two thousand, two hundred eighteen".