67691864 has 8 divisors (see below), whose sum is σ = 126922260. Its totient is φ = 33845928.

The previous prime is 67691849. The next prime is 67691867. The reversal of 67691864 is 46819676.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67691867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4230734 + ... + 4230749.

Almost surely, 2^67691864 is an apocalyptic number.

It is an amenable number.

67691864 is a deficient number, since it is larger than the sum of its proper divisors (59230396).

67691864 is a wasteful number, since it uses less digits than its factorization.

67691864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8461489 (or 8461485 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 67691864 is about 8227.5065481590. The cubic root of 67691864 is about 407.5480546037.

The spelling of 67691864 in words is "sixty-seven million, six hundred ninety-one thousand, eight hundred sixty-four".