28321626 has 16 divisors (see below), whose sum is σ = 59975424. Its totient is φ = 8885184.

The previous prime is 28321619. The next prime is 28321627. The reversal of 28321626 is 62612382.

It is a super-2 number, since 2×28321626² = 1604228998567752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28321593 and 28321602.

It is not an unprimeable number, because it can be changed into a prime (28321627) 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, 138730 + ... + 138933.

It is an arithmetic number, because the mean of its divisors is an integer number (3748464).

Almost surely, 2^28321626 is an apocalyptic number.

28321626 is an abundant number, since it is smaller than the sum of its proper divisors (31653798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28321626 is a wasteful number, since it uses less digits than its factorization.

28321626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277685.

The product of its digits is 6912, while the sum is 30.

The square root of 28321626 is about 5321.8066481224. The cubic root of 28321626 is about 304.8171474085.

The spelling of 28321626 in words is "twenty-eight million, three hundred twenty-one thousand, six hundred twenty-six".