67688897 has 8 divisors (see below), whose sum is σ = 69161256. Its totient is φ = 66223872.

The previous prime is 67688867. The next prime is 67688911. The reversal of 67688897 is 79888676.

It can be written as a sum of positive squares in 4 ways, for example, as 36675136 + 31013761 = 6056^2 + 5569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67688897 - 2⁸ = 67688641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67688807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19433 + ... + 22649.

It is an arithmetic number, because the mean of its divisors is an integer number (8645157).

Almost surely, 2^67688897 is an apocalyptic number.

It is an amenable number.

67688897 is a deficient number, since it is larger than the sum of its proper divisors (1472359).

67688897 is a wasteful number, since it uses less digits than its factorization.

67688897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667.

The product of its digits is 8128512, while the sum is 59.

The square root of 67688897 is about 8227.3262363905. The cubic root of 67688897 is about 407.5421001079.

The spelling of 67688897 in words is "sixty-seven million, six hundred eighty-eight thousand, eight hundred ninety-seven".