28212056811 has 16 divisors (see below), whose sum is σ = 41915412000. Its totient is φ = 18754140384.

The previous prime is 28212056809. The next prime is 28212056813. The reversal of 28212056811 is 11865021282.

28212056811 is a `hidden beast` number, since 2 + 82 + 1 + 2 + 0 + 568 + 11 = 666.

It is an interprime number because it is at equal distance from previous prime (28212056809) and next prime (28212056813).

It is not a de Polignac number, because 28212056811 - 2¹ = 28212056809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28212056813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1487556 + ... + 1506401.

It is an arithmetic number, because the mean of its divisors is an integer number (2619713250).

Almost surely, 2^28212056811 is an apocalyptic number.

28212056811 is a deficient number, since it is larger than the sum of its proper divisors (13703355189).

28212056811 is a wasteful number, since it uses less digits than its factorization.

28212056811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994315 (or 2994309 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 28212056811 in words is "twenty-eight billion, two hundred twelve million, fifty-six thousand, eight hundred eleven".