67978985 has 8 divisors (see below), whose sum is σ = 81660096. Its totient is φ = 54326320.

The previous prime is 67978969. The next prime is 67978991. The reversal of 67978985 is 58987976.

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

It is not a de Polignac number, because 67978985 - 2⁴ = 67978969 is a prime.

It is a super-2 number, since 2×67978985² = 9242284803260450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1439 + ... + 11748.

It is an arithmetic number, because the mean of its divisors is an integer number (10207512).

Almost surely, 2^67978985 is an apocalyptic number.

It is an amenable number.

67978985 is a deficient number, since it is larger than the sum of its proper divisors (13681111).

67978985 is a wasteful number, since it uses less digits than its factorization.

67978985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14223.

The product of its digits is 7620480, while the sum is 59.

The square root of 67978985 is about 8244.9369312324. The cubic root of 67978985 is about 408.1234588095.

The spelling of 67978985 in words is "sixty-seven million, nine hundred seventy-eight thousand, nine hundred eighty-five".