28057023 has 16 divisors (see below), whose sum is σ = 42082400. Its totient is φ = 18703224.

The previous prime is 28057019. The next prime is 28057049. The reversal of 28057023 is 32075082.

It is not a de Polignac number, because 28057023 - 2² = 28057019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057223) 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, 4228 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (2630150).

Almost surely, 2^28057023 is an apocalyptic number.

28057023 is a deficient number, since it is larger than the sum of its proper divisors (14025377).

28057023 is an frugal number, since it uses more digits than its factorization.

28057023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12850 (or 12832 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 28057023 is about 5296.8880486565. Note that the first 3 decimals coincide. The cubic root of 28057023 is about 303.8648948066.

The spelling of 28057023 in words is "twenty-eight million, fifty-seven thousand, twenty-three".