67920971 has 4 divisors (see below), whose sum is σ = 67938600. Its totient is φ = 67903344.

The previous prime is 67920949. The next prime is 67921003. The reversal of 67920971 is 17902976.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67920971 - 2¹⁴ = 67904587 is a prime.

It is a super-2 number, since 2×67920971² = 9226516603165682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67920911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281 + ... + 11658.

It is an arithmetic number, because the mean of its divisors is an integer number (16984650).

Almost surely, 2^67920971 is an apocalyptic number.

67920971 is a deficient number, since it is larger than the sum of its proper divisors (17629).

67920971 is a wasteful number, since it uses less digits than its factorization.

67920971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17628.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 67920971 is about 8241.4180211903. The cubic root of 67920971 is about 408.0073267779.

The spelling of 67920971 in words is "sixty-seven million, nine hundred twenty thousand, nine hundred seventy-one".