68442649 has 4 divisors (see below), whose sum is σ = 74664720. Its totient is φ = 62220580.

The previous prime is 68442643. The next prime is 68442659. The reversal of 68442649 is 94624486.

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 68442649 - 2⁹ = 68442137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68442643) 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, 3111019 + ... + 3111040.

It is an arithmetic number, because the mean of its divisors is an integer number (18666180).

Almost surely, 2^68442649 is an apocalyptic number.

It is an amenable number.

68442649 is a deficient number, since it is larger than the sum of its proper divisors (6222071).

68442649 is a wasteful number, since it uses less digits than its factorization.

68442649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6222070.

The product of its digits is 331776, while the sum is 43.

The square root of 68442649 is about 8273.0072525050. The cubic root of 68442649 is about 409.0492525021.

The spelling of 68442649 in words is "sixty-eight million, four hundred forty-two thousand, six hundred forty-nine".