68408149 has 4 divisors (see below), whose sum is σ = 68715136. Its totient is φ = 68101164.

The previous prime is 68408143. The next prime is 68408173. The reversal of 68408149 is 94180486.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94180486 = 2 ⋅47090243.

It is a cyclic number.

It is not a de Polignac number, because 68408149 - 2⁵ = 68408117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68408143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153159 + ... + 153604.

It is an arithmetic number, because the mean of its divisors is an integer number (17178784).

Almost surely, 2^68408149 is an apocalyptic number.

It is an amenable number.

68408149 is a deficient number, since it is larger than the sum of its proper divisors (306987).

68408149 is a wasteful number, since it uses less digits than its factorization.

68408149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306986.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 68408149 is about 8270.9218954117. The cubic root of 68408149 is about 408.9805109047.

The spelling of 68408149 in words is "sixty-eight million, four hundred eight thousand, one hundred forty-nine".