67971993 has 8 divisors (see below), whose sum is σ = 90670368. Its totient is φ = 45294144.

The previous prime is 67971991. The next prime is 67972007. The reversal of 67971993 is 39917976.

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

It is not a de Polignac number, because 67971993 - 2¹ = 67971991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67971991) 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, 6130 + ... + 13172.

It is an arithmetic number, because the mean of its divisors is an integer number (11333796).

Almost surely, 2^67971993 is an apocalyptic number.

It is an amenable number.

67971993 is a deficient number, since it is larger than the sum of its proper divisors (22698375).

67971993 is a wasteful number, since it uses less digits than its factorization.

67971993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10263.

The product of its digits is 642978, while the sum is 51.

The square root of 67971993 is about 8244.5129025310. The cubic root of 67971993 is about 408.1094657740.

The spelling of 67971993 in words is "sixty-seven million, nine hundred seventy-one thousand, nine hundred ninety-three".