68671649 has 4 divisors (see below), whose sum is σ = 68694720. Its totient is φ = 68648580.

The previous prime is 68671633. The next prime is 68671657. The reversal of 68671649 is 94617686.

It is a happy number.

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 68671649 - 2⁴ = 68671633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68671609) 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, 6269 + ... + 13290.

It is an arithmetic number, because the mean of its divisors is an integer number (17173680).

Almost surely, 2^68671649 is an apocalyptic number.

It is an amenable number.

68671649 is a deficient number, since it is larger than the sum of its proper divisors (23071).

68671649 is a wasteful number, since it uses less digits than its factorization.

68671649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23070.

The product of its digits is 435456, while the sum is 47.

The square root of 68671649 is about 8286.8358859097. The cubic root of 68671649 is about 409.5049527723.

The spelling of 68671649 in words is "sixty-eight million, six hundred seventy-one thousand, six hundred forty-nine".