67839987 has 8 divisors (see below), whose sum is σ = 90661120. Its totient is φ = 45122760.

The previous prime is 67839973. The next prime is 67840001. The reversal of 67839987 is 78993876.

It is an interprime number because it is at equal distance from previous prime (67839973) and next prime (67840001).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67839987 - 2⁸ = 67839731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67839287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24439 + ... + 27072.

It is an arithmetic number, because the mean of its divisors is an integer number (11332640).

Almost surely, 2^67839987 is an apocalyptic number.

67839987 is a deficient number, since it is larger than the sum of its proper divisors (22821133).

67839987 is a wasteful number, since it uses less digits than its factorization.

67839987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51953.

The product of its digits is 4572288, while the sum is 57.

The square root of 67839987 is about 8236.5033236198. The cubic root of 67839987 is about 407.8451029175.

The spelling of 67839987 in words is "sixty-seven million, eight hundred thirty-nine thousand, nine hundred eighty-seven".