67799991 has 32 divisors (see below), whose sum is σ = 107071488. Its totient is φ = 37359360.

The previous prime is 67799951. The next prime is 67800001. The reversal of 67799991 is 19999776.

It is not a de Polignac number, because 67799991 - 2¹⁰ = 67798967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67799951) 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 31 ways as a sum of consecutive naturals, for example, 71581 + ... + 72521.

It is an arithmetic number, because the mean of its divisors is an integer number (3345984).

Almost surely, 2^67799991 is an apocalyptic number.

67799991 is a deficient number, since it is larger than the sum of its proper divisors (39271497).

67799991 is a wasteful number, since it uses less digits than its factorization.

67799991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071.

The product of its digits is 1928934, while the sum is 57.

The square root of 67799991 is about 8234.0749935861. The cubic root of 67799991 is about 407.7649369259.

The spelling of 67799991 in words is "sixty-seven million, seven hundred ninety-nine thousand, nine hundred ninety-one".