68990687 has 2 divisors, whose sum is σ = 68990688. Its totient is φ = 68990686.

The previous prime is 68990651. The next prime is 68990707. The reversal of 68990687 is 78609986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68990687 - 2⁸ = 68990431 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68990587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34495343 + 34495344.

It is an arithmetic number, because the mean of its divisors is an integer number (34495344).

Almost surely, 2^68990687 is an apocalyptic number.

68990687 is a deficient number, since it is larger than the sum of its proper divisors (1).

68990687 is an equidigital number, since it uses as much as digits as its factorization.

68990687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 68990687 is about 8306.0632672765. The cubic root of 68990687 is about 410.1381390561.

The spelling of 68990687 in words is "sixty-eight million, nine hundred ninety thousand, six hundred eighty-seven".