28178172494 has 16 divisors (see below), whose sum is σ = 43019392416. Its totient is φ = 13839012000.

The previous prime is 28178172457. The next prime is 28178172497. The reversal of 28178172494 is 49427187182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28178172497) 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, 70157 + ... + 247544.

It is an arithmetic number, because the mean of its divisors is an integer number (2688712026).

Almost surely, 2^28178172494 is an apocalyptic number.

28178172494 is a deficient number, since it is larger than the sum of its proper divisors (14841219922).

28178172494 is a wasteful number, since it uses less digits than its factorization.

28178172494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318491.

The product of its digits is 1806336, while the sum is 53.

The spelling of 28178172494 in words is "twenty-eight billion, one hundred seventy-eight million, one hundred seventy-two thousand, four hundred ninety-four".