68909953 has 4 divisors (see below), whose sum is σ = 78754240. Its totient is φ = 59065668.

The previous prime is 68909927. The next prime is 68909989. The reversal of 68909953 is 35990986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35990986 = 2 ⋅17995493.

It is a cyclic number.

It is not a de Polignac number, because 68909953 - 2⁵ = 68909921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68909897 and 68909906.

It is not an unprimeable number, because it can be changed into a prime (68909923) 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 in 3 ways as a sum of consecutive naturals, for example, 4922133 + ... + 4922146.

It is an arithmetic number, because the mean of its divisors is an integer number (19688560).

Almost surely, 2^68909953 is an apocalyptic number.

It is an amenable number.

68909953 is a deficient number, since it is larger than the sum of its proper divisors (9844287).

68909953 is an equidigital number, since it uses as much as digits as its factorization.

68909953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9844286.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 68909953 is about 8301.2019009298. The cubic root of 68909953 is about 409.9780932178.

The spelling of 68909953 in words is "sixty-eight million, nine hundred nine thousand, nine hundred fifty-three".