68604993 has 12 divisors (see below), whose sum is σ = 101774868. Its totient is φ = 44500320.

The previous prime is 68604989. The next prime is 68604997. The reversal of 68604993 is 39940686.

It is an interprime number because it is at equal distance from previous prime (68604989) and next prime (68604997).

It can be written as a sum of positive squares in 2 ways, for example, as 29517489 + 39087504 = 5433^2 + 6252^2 .

It is not a de Polignac number, because 68604993 - 2² = 68604989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68604997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102678 + ... + 103343.

It is an arithmetic number, because the mean of its divisors is an integer number (8481239).

Almost surely, 2^68604993 is an apocalyptic number.

It is an amenable number.

68604993 is a deficient number, since it is larger than the sum of its proper divisors (33169875).

68604993 is a wasteful number, since it uses less digits than its factorization.

68604993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206064 (or 206061 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 68604993 is about 8282.8131090832. The cubic root of 68604993 is about 409.3724148235.

The spelling of 68604993 in words is "sixty-eight million, six hundred four thousand, nine hundred ninety-three".