67648657 has 4 divisors (see below), whose sum is σ = 67988800. Its totient is φ = 67308516.

The previous prime is 67648639. The next prime is 67648667. The reversal of 67648657 is 75684676.

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 67648657 - 2²³ = 59260049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67648657.

It is not an unprimeable number, because it can be changed into a prime (67648667) 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, 169773 + ... + 170170.

It is an arithmetic number, because the mean of its divisors is an integer number (16997200).

Almost surely, 2^67648657 is an apocalyptic number.

It is an amenable number.

67648657 is a deficient number, since it is larger than the sum of its proper divisors (340143).

67648657 is a wasteful number, since it uses less digits than its factorization.

67648657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340142.

The product of its digits is 1693440, while the sum is 49.

The square root of 67648657 is about 8224.8803638716. The cubic root of 67648657 is about 407.4613249456.

The spelling of 67648657 in words is "sixty-seven million, six hundred forty-eight thousand, six hundred fifty-seven".