68307553 has 4 divisors (see below), whose sum is σ = 68362240. Its totient is φ = 68252868.

The previous prime is 68307529. The next prime is 68307559. The reversal of 68307553 is 35570386.

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.

It is a cyclic number.

It is not a de Polignac number, because 68307553 - 2²¹ = 66210401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68307559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25425 + ... + 27982.

It is an arithmetic number, because the mean of its divisors is an integer number (17090560).

Almost surely, 2^68307553 is an apocalyptic number.

It is an amenable number.

68307553 is a deficient number, since it is larger than the sum of its proper divisors (54687).

68307553 is a wasteful number, since it uses less digits than its factorization.

68307553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54686.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 68307553 is about 8264.8383529262. The cubic root of 68307553 is about 408.7799403232.

The spelling of 68307553 in words is "sixty-eight million, three hundred seven thousand, five hundred fifty-three".