28002621 has 8 divisors (see below), whose sum is σ = 39533184. Its totient is φ = 17570240.

The previous prime is 28002619. The next prime is 28002629. The reversal of 28002621 is 12620082.

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 28002621 - 2¹ = 28002619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28002629) 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, 274485 + ... + 274586.

It is an arithmetic number, because the mean of its divisors is an integer number (4941648).

Almost surely, 2^28002621 is an apocalyptic number.

It is an amenable number.

28002621 is a deficient number, since it is larger than the sum of its proper divisors (11530563).

28002621 is a wasteful number, since it uses less digits than its factorization.

28002621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549091.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28002621 is about 5291.7502775547. The cubic root of 28002621 is about 303.6683717725.

The spelling of 28002621 in words is "twenty-eight million, two thousand, six hundred twenty-one".