28626021 has 8 divisors (see below), whose sum is σ = 42408960. Its totient is φ = 19083996.

The previous prime is 28625999. The next prime is 28626043. The reversal of 28626021 is 12062682.

It is an interprime number because it is at equal distance from previous prime (28625999) and next prime (28626043).

It is not a de Polignac number, because 28626021 - 2⁶ = 28625957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1060223 = 28626021 / (2 + 8 + 6 + 2 + 6 + 0 + 2 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28626061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530085 + ... + 530138.

It is an arithmetic number, because the mean of its divisors is an integer number (5301120).

Almost surely, 2^28626021 is an apocalyptic number.

It is an amenable number.

28626021 is a deficient number, since it is larger than the sum of its proper divisors (13782939).

28626021 is a wasteful number, since it uses less digits than its factorization.

28626021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060232 (or 1060226 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28626021 is about 5350.3290553012. The cubic root of 28626021 is about 305.9052955678.

The spelling of 28626021 in words is "twenty-eight million, six hundred twenty-six thousand, twenty-one".