18978276128 has 48 divisors (see below), whose sum is σ = 45212961024. Its totient is φ = 7655101440.

The previous prime is 18978276101. The next prime is 18978276133. The reversal of 18978276128 is 82167287981.

It is a super-2 number, since 2×18978276128² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2488088 + ... + 2495703.

It is an arithmetic number, because the mean of its divisors is an integer number (941936688).

Almost surely, 2^18978276128 is an apocalyptic number.

It is an amenable number.

18978276128 is an abundant number, since it is smaller than the sum of its proper divisors (26234684896).

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

18978276128 is a wasteful number, since it uses less digits than its factorization.

18978276128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4983825 (or 4983817 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 59.

The spelling of 18978276128 in words is "eighteen billion, nine hundred seventy-eight million, two hundred seventy-six thousand, one hundred twenty-eight".