18961267228 has 12 divisors (see below), whose sum is σ = 33184992400. Its totient is φ = 9479840832.

The previous prime is 18961267201. The next prime is 18961267231. The reversal of 18961267228 is 82276216981.

It is a congruent number.

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, 142653 + ... + 241396.

Almost surely, 2^18961267228 is an apocalyptic number.

It is an amenable number.

18961267228 is a deficient number, since it is larger than the sum of its proper divisors (14223725172).

18961267228 is a wasteful number, since it uses less digits than its factorization.

18961267228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396396 (or 396394 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 52.

The spelling of 18961267228 in words is "eighteen billion, nine hundred sixty-one million, two hundred sixty-seven thousand, two hundred twenty-eight".