28896260121 has 9 divisors (see below), whose sum is σ = 41739779029. Its totient is φ = 19263833436.

The previous prime is 28896260039. The next prime is 28896260131. The reversal of 28896260121 is 12106269882.

The square root of 28896260121 is 169989.

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

28896260121 is a `hidden beast` number, since 2 + 8 + 8 + 9 + 626 + 0 + 12 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-28896260121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28896260131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 481636 + ... + 538298.

Almost surely, 2^28896260121 is an apocalyptic number.

28896260121 is the 169989-th square number.

28896260121 is the 84995-th centered octagonal number.

It is an amenable number.

28896260121 is a deficient number, since it is larger than the sum of its proper divisors (12843518908).

28896260121 is an frugal number, since it uses more digits than its factorization.

28896260121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113332 (or 56666 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 28896260121 in words is "twenty-eight billion, eight hundred ninety-six million, two hundred sixty thousand, one hundred twenty-one".