68517090 has 40 divisors (see below), whose sum is σ = 184237020. Its totient is φ = 18271008.

The previous prime is 68517079. The next prime is 68517101. The reversal of 68517090 is 9071586.

It is an interprime number because it is at equal distance from previous prime (68517079) and next prime (68517101).

It can be written as a sum of positive squares in 2 ways, for example, as 67519089 + 998001 = 8217^2 + 999^2 .

It is a Curzon number.

It is an unprimeable number.

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 in 19 ways as a sum of consecutive naturals, for example, 41485 + ... + 43104.

Almost surely, 2^68517090 is an apocalyptic number.

68517090 is an abundant number, since it is smaller than the sum of its proper divisors (115719930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68517090 is a wasteful number, since it uses less digits than its factorization.

68517090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84608 (or 84599 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 68517090 is about 8277.5050588930. The cubic root of 68517090 is about 409.1974982862.

The spelling of 68517090 in words is "sixty-eight million, five hundred seventeen thousand, ninety".