28700023 has 16 divisors (see below), whose sum is σ = 32138496. Its totient is φ = 25410240.

The previous prime is 28699997. The next prime is 28700081. The reversal of 28700023 is 32000782.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28700023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28699967 and 28700003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28760023) 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, 82536 + ... + 82882.

It is an arithmetic number, because the mean of its divisors is an integer number (2008656).

Almost surely, 2^28700023 is an apocalyptic number.

28700023 is a deficient number, since it is larger than the sum of its proper divisors (3438473).

28700023 is a wasteful number, since it uses less digits than its factorization.

28700023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 28700023 is about 5357.2402410196. The cubic root of 28700023 is about 306.1686704485.

The spelling of 28700023 in words is "twenty-eight million, seven hundred thousand, twenty-three".