28226980790649 has 15 divisors (see below), whose sum is σ = 42166301993013. Its totient is φ = 18817955316324.

The previous prime is 28226980790647. The next prime is 28226980790653. The reversal of 28226980790649 is 94609708962282.

The square root of 28226980790649 is 5312907.

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

28226980790649 is a `hidden beast` number, since 282 + 269 + 80 + 7 + 9 + 0 + 6 + 4 + 9 = 666.

It is not a de Polignac number, because 28226980790649 - 2¹ = 28226980790647 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28226980790647) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 47521002 + ... + 48111324.

Almost surely, 2^{28226980790649} is an apocalyptic number.

28226980790649 is the 5312907-th square number.

28226980790649 is the 2656454-th centered octagonal number.

It is an amenable number.

28226980790649 is a deficient number, since it is larger than the sum of its proper divisors (13939321202364).

28226980790649 is an frugal number, since it uses more digits than its factorization.

28226980790649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180658 (or 590326 counting only the distinct ones).

The product of its (nonzero) digits is 376233984, while the sum is 72.

The spelling of 28226980790649 in words is "twenty-eight trillion, two hundred twenty-six billion, nine hundred eighty million, seven hundred ninety thousand, six hundred forty-nine".