68687149 has 4 divisors (see below), whose sum is σ = 68908320. Its totient is φ = 68465980.

The previous prime is 68687117. The next prime is 68687153. The reversal of 68687149 is 94178686.

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 68687149 - 2⁵ = 68687117 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 (68681149) 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, 110119 + ... + 110740.

It is an arithmetic number, because the mean of its divisors is an integer number (17227080).

Almost surely, 2^68687149 is an apocalyptic number.

It is an amenable number.

68687149 is a deficient number, since it is larger than the sum of its proper divisors (221171).

68687149 is a wasteful number, since it uses less digits than its factorization.

68687149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221170.

The product of its digits is 580608, while the sum is 49.

The square root of 68687149 is about 8287.7710513744. The cubic root of 68687149 is about 409.5357604848.

The spelling of 68687149 in words is "sixty-eight million, six hundred eighty-seven thousand, one hundred forty-nine".