28020123 has 12 divisors (see below), whose sum is σ = 40701960. Its totient is φ = 18574656.

The previous prime is 28020107. The next prime is 28020151. The reversal of 28020123 is 32102082.

It is a happy number.

It is not a de Polignac number, because 28020123 - 2⁴ = 28020107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28020096 and 28020105.

It is not an unprimeable number, because it can be changed into a prime (28020023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7086 + ... + 10307.

It is an arithmetic number, because the mean of its divisors is an integer number (3391830).

Almost surely, 2^28020123 is an apocalyptic number.

28020123 is a deficient number, since it is larger than the sum of its proper divisors (12681837).

28020123 is a wasteful number, since it uses less digits than its factorization.

28020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17578 (or 17575 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28020123 is about 5293.4037253926. The cubic root of 28020123 is about 303.7316241487.

The spelling of 28020123 in words is "twenty-eight million, twenty thousand, one hundred twenty-three".