28626649 has 2 divisors, whose sum is σ = 28626650. Its totient is φ = 28626648.

The previous prime is 28626607. The next prime is 28626659. The reversal of 28626649 is 94662682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28164249 + 462400 = 5307^2 + 680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28626649 is a prime.

It is equal to p_1777993 and since 28626649 and 1777993 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28626659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14313324 + 14313325.

It is an arithmetic number, because the mean of its divisors is an integer number (14313325).

Almost surely, 2^28626649 is an apocalyptic number.

It is an amenable number.

28626649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28626649 is an equidigital number, since it uses as much as digits as its factorization.

28626649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The square root of 28626649 is about 5350.3877429584. The cubic root of 28626649 is about 305.9075325433.

The spelling of 28626649 in words is "twenty-eight million, six hundred twenty-six thousand, six hundred forty-nine".