28373421 has 32 divisors (see below), whose sum is σ = 41260032. Its totient is φ = 17297280.

The previous prime is 28373419. The next prime is 28373431. The reversal of 28373421 is 12437382.

It is not a de Polignac number, because 28373421 - 2¹ = 28373419 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28373431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216526 + ... + 216656.

It is an arithmetic number, because the mean of its divisors is an integer number (1289376).

Almost surely, 2^28373421 is an apocalyptic number.

It is an amenable number.

28373421 is a deficient number, since it is larger than the sum of its proper divisors (12886611).

28373421 is a wasteful number, since it uses less digits than its factorization.

28373421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273.

The product of its digits is 8064, while the sum is 30.

The square root of 28373421 is about 5326.6707238199. The cubic root of 28373421 is about 305.0028522532.

The spelling of 28373421 in words is "twenty-eight million, three hundred seventy-three thousand, four hundred twenty-one".