28602021 has 16 divisors (see below), whose sum is σ = 43816064. Its totient is φ = 16257024.

The previous prime is 28602017. The next prime is 28602023. The reversal of 28602021 is 12020682.

It is not a de Polignac number, because 28602021 - 2² = 28602017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28602023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (2738504).

Almost surely, 2^28602021 is an apocalyptic number.

28602021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28602021 is a deficient number, since it is larger than the sum of its proper divisors (15214043).

28602021 is a wasteful number, since it uses less digits than its factorization.

28602021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7260.

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

The square root of 28602021 is about 5348.0857322971. The cubic root of 28602021 is about 305.8197815314.

The spelling of 28602021 in words is "twenty-eight million, six hundred two thousand, twenty-one".