28475421 has 8 divisors (see below), whose sum is σ = 40887840. Its totient is φ = 17523312.

The previous prime is 28475399. The next prime is 28475423. The reversal of 28475421 is 12457482.

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

It is not a de Polignac number, because 28475421 - 2⁹ = 28474909 is a prime.

It is a super-2 number, since 2×28475421² = 1621699202254482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28475423) 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, 365031 + ... + 365108.

It is an arithmetic number, because the mean of its divisors is an integer number (5110980).

Almost surely, 2^28475421 is an apocalyptic number.

It is an amenable number.

28475421 is a deficient number, since it is larger than the sum of its proper divisors (12412419).

28475421 is a wasteful number, since it uses less digits than its factorization.

28475421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730155.

The product of its digits is 17920, while the sum is 33.

The square root of 28475421 is about 5336.2365952045. The cubic root of 28475421 is about 305.3679014730.

The spelling of 28475421 in words is "twenty-eight million, four hundred seventy-five thousand, four hundred twenty-one".