18087728642 has 16 divisors (see below), whose sum is σ = 28562556960. Its totient is φ = 8566975872.

The previous prime is 18087728639. The next prime is 18087728653. The reversal of 18087728642 is 24682778081.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472658 + ... + 509490.

It is an arithmetic number, because the mean of its divisors is an integer number (1785159810).

Almost surely, 2^18087728642 is an apocalyptic number.

18087728642 is a deficient number, since it is larger than the sum of its proper divisors (10474828318).

18087728642 is a wasteful number, since it uses less digits than its factorization.

18087728642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49777.

The product of its (nonzero) digits is 2408448, while the sum is 53.

The spelling of 18087728642 in words is "eighteen billion, eighty-seven million, seven hundred twenty-eight thousand, six hundred forty-two".