28197671781904 has 45 divisors (see below), whose sum is σ = 57112601894383. Its totient is φ = 13485609379616.

The previous prime is 28197671781893. The next prime is 28197671781941. The reversal of 28197671781904 is 40918717679182.

It is a happy number.

The square root of 28197671781904 is 5310148.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 488504757 + ... + 488562475.

Almost surely, 2^{28197671781904} is an apocalyptic number.

28197671781904 is the 5310148-th square number.

It is an amenable number.

28197671781904 is an abundant number, since it is smaller than the sum of its proper divisors (28914930112479).

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

28197671781904 is an frugal number, since it uses more digits than its factorization.

28197671781904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115492 (or 57744 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 70.

The spelling of 28197671781904 in words is "twenty-eight trillion, one hundred ninety-seven billion, six hundred seventy-one million, seven hundred eighty-one thousand, nine hundred four".