28326631 has 4 divisors (see below), whose sum is σ = 28791064. Its totient is φ = 27862200.

The previous prime is 28326601. The next prime is 28326643. The reversal of 28326631 is 13662382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28326631 - 2⁷ = 28326503 is a prime.

It is a super-2 number, since 2×28326631² = 1604796047620322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28326593 and 28326602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28326601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232125 + ... + 232246.

It is an arithmetic number, because the mean of its divisors is an integer number (7197766).

Almost surely, 2^28326631 is an apocalyptic number.

28326631 is a deficient number, since it is larger than the sum of its proper divisors (464433).

28326631 is an equidigital number, since it uses as much as digits as its factorization.

28326631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464432.

The product of its digits is 10368, while the sum is 31.

The square root of 28326631 is about 5322.2768623964. The cubic root of 28326631 is about 304.8351021211.

The spelling of 28326631 in words is "twenty-eight million, three hundred twenty-six thousand, six hundred thirty-one".