99990679 has 2 divisors, whose sum is σ = 99990680. Its totient is φ = 99990678.

The previous prime is 99990647. The next prime is 99990703. The reversal of 99990679 is 97609999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99990679 - 2⁵ = 99990647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99993679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995339 + 49995340.

It is an arithmetic number, because the mean of its divisors is an integer number (49995340).

Almost surely, 2^99990679 is an apocalyptic number.

99990679 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990679 is an equidigital number, since it uses as much as digits as its factorization.

99990679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2480058, while the sum is 58.

The square root of 99990679 is about 9999.5339391394. The cubic root of 99990679 is about 464.1444614967.

The spelling of 99990679 in words is "ninety-nine million, nine hundred ninety thousand, six hundred seventy-nine".