67940991 has 32 divisors (see below), whose sum is σ = 105646080. Its totient is φ = 43102368.

The previous prime is 67940953. The next prime is 67941043. The reversal of 67940991 is 19904976.

It is not a de Polignac number, because 67940991 - 2⁶ = 67940927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67940921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46230 + ... + 47676.

It is an arithmetic number, because the mean of its divisors is an integer number (3301440).

Almost surely, 2^67940991 is an apocalyptic number.

67940991 is a deficient number, since it is larger than the sum of its proper divisors (37705089).

67940991 is a wasteful number, since it uses less digits than its factorization.

67940991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 1534 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 67940991 is about 8242.6325285069. The cubic root of 67940991 is about 408.0474101481.

The spelling of 67940991 in words is "sixty-seven million, nine hundred forty thousand, nine hundred ninety-one".