28180388173 has 8 divisors (see below), whose sum is σ = 32207438592. Its totient is φ = 24153657936.

The previous prime is 28180388143. The next prime is 28180388183. The reversal of 28180388173 is 37188308182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28180388173 - 2⁹ = 28180387661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28180388143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154311 + ... + 283147.

It is an arithmetic number, because the mean of its divisors is an integer number (4025929824).

Almost surely, 2^28180388173 is an apocalyptic number.

It is an amenable number.

28180388173 is a deficient number, since it is larger than the sum of its proper divisors (4027050419).

28180388173 is a wasteful number, since it uses less digits than its factorization.

28180388173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160091.

The product of its (nonzero) digits is 516096, while the sum is 49.

The spelling of 28180388173 in words is "twenty-eight billion, one hundred eighty million, three hundred eighty-eight thousand, one hundred seventy-three".