18281502078 has 32 divisors (see below), whose sum is σ = 41795066880. Its totient is φ = 5222189280.

The previous prime is 18281502017. The next prime is 18281502079. The reversal of 18281502078 is 87020518281.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18281502079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168448 + ... + 254828.

It is an arithmetic number, because the mean of its divisors is an integer number (1306095840).

Almost surely, 2^18281502078 is an apocalyptic number.

18281502078 is an abundant number, since it is smaller than the sum of its proper divisors (23513564802).

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

18281502078 is a wasteful number, since it uses less digits than its factorization.

18281502078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91432.

The product of its (nonzero) digits is 71680, while the sum is 42.

The spelling of 18281502078 in words is "eighteen billion, two hundred eighty-one million, five hundred two thousand, seventy-eight".