68990357 has 2 divisors, whose sum is σ = 68990358. Its totient is φ = 68990356.

The previous prime is 68990297. The next prime is 68990371. The reversal of 68990357 is 75309986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67749361 + 1240996 = 8231^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 68990357 - 2¹⁴ = 68973973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68993357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34495178 + 34495179.

It is an arithmetic number, because the mean of its divisors is an integer number (34495179).

Almost surely, 2^68990357 is an apocalyptic number.

It is an amenable number.

68990357 is a deficient number, since it is larger than the sum of its proper divisors (1).

68990357 is an equidigital number, since it uses as much as digits as its factorization.

68990357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 68990357 is about 8306.0434022463. The cubic root of 68990357 is about 410.1374851234.

The spelling of 68990357 in words is "sixty-eight million, nine hundred ninety thousand, three hundred fifty-seven".