28021623 has 8 divisors (see below), whose sum is σ = 42699648. Its totient is φ = 16012344.

The previous prime is 28021621. The next prime is 28021633. The reversal of 28021623 is 32612082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28021623 - 2¹ = 28021621 is a prime.

It is a super-2 number, since 2×28021623² = 1570422711108258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28021593 and 28021602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28021621) 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, 667161 + ... + 667202.

It is an arithmetic number, because the mean of its divisors is an integer number (5337456).

Almost surely, 2^28021623 is an apocalyptic number.

28021623 is a deficient number, since it is larger than the sum of its proper divisors (14678025).

28021623 is a wasteful number, since it uses less digits than its factorization.

28021623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334373.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28021623 is about 5293.5454092697. The cubic root of 28021623 is about 303.7370439359.

The spelling of 28021623 in words is "twenty-eight million, twenty-one thousand, six hundred twenty-three".