28373821 has 8 divisors (see below), whose sum is σ = 34134080. Its totient is φ = 23040288.

The previous prime is 28373809. The next prime is 28373837. The reversal of 28373821 is 12837382.

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

It is a cyclic number.

It is not a de Polignac number, because 28373821 - 2⁷ = 28373693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28373621) 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, 106536 + ... + 106801.

It is an arithmetic number, because the mean of its divisors is an integer number (4266760).

Almost surely, 2^28373821 is an apocalyptic number.

It is an amenable number.

28373821 is a deficient number, since it is larger than the sum of its proper divisors (5760259).

28373821 is a wasteful number, since it uses less digits than its factorization.

28373821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213363.

The product of its digits is 16128, while the sum is 34.

The square root of 28373821 is about 5326.7082705926. The cubic root of 28373821 is about 305.0042855261.

The spelling of 28373821 in words is "twenty-eight million, three hundred seventy-three thousand, eight hundred twenty-one".