67991607 has 24 divisors (see below), whose sum is σ = 101487360. Its totient is φ = 43830720.

The previous prime is 67991591. The next prime is 67991617. The reversal of 67991607 is 70619976.

It is not a de Polignac number, because 67991607 - 2⁴ = 67991591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67991617) 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 23 ways as a sum of consecutive naturals, for example, 63069 + ... + 64137.

It is an arithmetic number, because the mean of its divisors is an integer number (4228640).

Almost surely, 2^67991607 is an apocalyptic number.

67991607 is a deficient number, since it is larger than the sum of its proper divisors (33495753).

67991607 is a wasteful number, since it uses less digits than its factorization.

67991607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303 (or 1300 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 67991607 is about 8245.7023351562. The cubic root of 67991607 is about 408.1487166913.

The spelling of 67991607 in words is "sixty-seven million, nine hundred ninety-one thousand, six hundred seven".