28212122 has 16 divisors (see below), whose sum is σ = 44271360. Its totient is φ = 13458192.

The previous prime is 28212103. The next prime is 28212127. The reversal of 28212122 is 22121282.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28212094 and 28212103.

It is not an unprimeable number, because it can be changed into a prime (28212127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32648 + ... + 33500.

It is an arithmetic number, because the mean of its divisors is an integer number (2766960).

Almost surely, 2^28212122 is an apocalyptic number.

28212122 is a deficient number, since it is larger than the sum of its proper divisors (16059238).

28212122 is a wasteful number, since it uses less digits than its factorization.

28212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597.

The product of its digits is 256, while the sum is 20.

The square root of 28212122 is about 5311.5084486424. The cubic root of 28212122 is about 304.4237871248.

The spelling of 28212122 in words is "twenty-eight million, two hundred twelve thousand, one hundred twenty-two".