28636649 has 2 divisors, whose sum is σ = 28636650. Its totient is φ = 28636648.

The previous prime is 28636639. The next prime is 28636669. The reversal of 28636649 is 94663682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25000000 + 3636649 = 5000^2 + 1907^2 .

It is a cyclic number.

It is not a de Polignac number, because 28636649 - 2¹⁶ = 28571113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28636639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14318324 + 14318325.

It is an arithmetic number, because the mean of its divisors is an integer number (14318325).

Almost surely, 2^28636649 is an apocalyptic number.

It is an amenable number.

28636649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28636649 is an equidigital number, since it uses as much as digits as its factorization.

28636649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 44.

The square root of 28636649 is about 5351.3221730709. The cubic root of 28636649 is about 305.9431487645.

The spelling of 28636649 in words is "twenty-eight million, six hundred thirty-six thousand, six hundred forty-nine".