28180638746 has 8 divisors (see below), whose sum is σ = 45522570324. Its totient is φ = 13006448640.

The previous prime is 28180638721. The next prime is 28180638767. The reversal of 28180638746 is 64783608182.

It can be written as a sum of positive squares in 2 ways, for example, as 19526988121 + 8653650625 = 139739^2 + 93025^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541935335 + ... + 541935386.

Almost surely, 2^28180638746 is an apocalyptic number.

28180638746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28180638746 is a deficient number, since it is larger than the sum of its proper divisors (17341931578).

28180638746 is a wasteful number, since it uses less digits than its factorization.

28180638746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083870736.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 28180638746 in words is "twenty-eight billion, one hundred eighty million, six hundred thirty-eight thousand, seven hundred forty-six".