68624999 has 2 divisors, whose sum is σ = 68625000. Its totient is φ = 68624998.

The previous prime is 68624989. The next prime is 68625001. The reversal of 68624999 is 99942686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68624999 - 2²⁰ = 67576423 is a prime.

It is a Sophie Germain prime.

Together with 68625001, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68624999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68624909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34312499 + 34312500.

It is an arithmetic number, because the mean of its divisors is an integer number (34312500).

Almost surely, 2^68624999 is an apocalyptic number.

68624999 is a deficient number, since it is larger than the sum of its proper divisors (1).

68624999 is an equidigital number, since it uses as much as digits as its factorization.

68624999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 53.

The square root of 68624999 is about 8284.0207025333. The cubic root of 68624999 is about 409.4122035144.

The spelling of 68624999 in words is "sixty-eight million, six hundred twenty-four thousand, nine hundred ninety-nine".