28769421 has 8 divisors (see below), whose sum is σ = 39682080. Its totient is φ = 18518192.

The previous prime is 28769383. The next prime is 28769449. The reversal of 28769421 is 12496782.

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 28769421 - 2⁶ = 28769357 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28769421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28769621) 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, 165255 + ... + 165428.

It is an arithmetic number, because the mean of its divisors is an integer number (4960260).

Almost surely, 2^28769421 is an apocalyptic number.

It is an amenable number.

28769421 is a deficient number, since it is larger than the sum of its proper divisors (10912659).

28769421 is a wasteful number, since it uses less digits than its factorization.

28769421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330715.

The product of its digits is 48384, while the sum is 39.

The square root of 28769421 is about 5363.7133592316. The cubic root of 28769421 is about 306.4152485384.

The spelling of 28769421 in words is "twenty-eight million, seven hundred sixty-nine thousand, four hundred twenty-one".