99890647 has 2 divisors, whose sum is σ = 99890648. Its totient is φ = 99890646.

The previous prime is 99890627. The next prime is 99890671. The reversal of 99890647 is 74609899.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99890647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99890594 and 99890603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99890627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49945323 + 49945324.

It is an arithmetic number, because the mean of its divisors is an integer number (49945324).

Almost surely, 2^99890647 is an apocalyptic number.

99890647 is a deficient number, since it is larger than the sum of its proper divisors (1).

99890647 is an equidigital number, since it uses as much as digits as its factorization.

99890647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 99890647 is about 9994.5308544223. The cubic root of 99890647 is about 463.9896310976.

The spelling of 99890647 in words is "ninety-nine million, eight hundred ninety thousand, six hundred forty-seven".