28311637 has 2 divisors, whose sum is σ = 28311638. Its totient is φ = 28311636.

The previous prime is 28311631. The next prime is 28311683. The reversal of 28311637 is 73611382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25796241 + 2515396 = 5079^2 + 1586^2 .

It is a cyclic number.

It is not a de Polignac number, because 28311637 - 2¹⁹ = 27787349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28311599 and 28311608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28311631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155818 + 14155819.

It is an arithmetic number, because the mean of its divisors is an integer number (14155819).

Almost surely, 2^28311637 is an apocalyptic number.

It is an amenable number.

28311637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311637 is an equidigital number, since it uses as much as digits as its factorization.

28311637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 28311637 is about 5320.8680682761. The cubic root of 28311637 is about 304.7813069931.

The spelling of 28311637 in words is "twenty-eight million, three hundred eleven thousand, six hundred thirty-seven".