28647637 has 2 divisors, whose sum is σ = 28647638. Its totient is φ = 28647636.

The previous prime is 28647631. The next prime is 28647667. The reversal of 28647637 is 73674682.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 13351716 = 3911^2 + 3654^2 .

It is a cyclic number.

It is not a de Polignac number, because 28647637 - 2³ = 28647629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28647593 and 28647602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28647631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323818 + 14323819.

It is an arithmetic number, because the mean of its divisors is an integer number (14323819).

Almost surely, 2^28647637 is an apocalyptic number.

It is an amenable number.

28647637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28647637 is an equidigital number, since it uses as much as digits as its factorization.

28647637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 43.

The square root of 28647637 is about 5352.3487367697. The cubic root of 28647637 is about 305.9822743089.

It can be divided in two parts, 2864 and 7637, that added together give a palindrome (10501).

The spelling of 28647637 in words is "twenty-eight million, six hundred forty-seven thousand, six hundred thirty-seven".