67720971 has 8 divisors (see below), whose sum is σ = 92497104. Its totient is φ = 44046080.

The previous prime is 67720951. The next prime is 67720973. The reversal of 67720971 is 17902776.

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

It is a cyclic number.

It is not a de Polignac number, because 67720971 - 2⁶ = 67720907 is a prime.

It is a super-2 number, since 2×67720971² = 9172259826365682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67720973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275166 + ... + 275411.

It is an arithmetic number, because the mean of its divisors is an integer number (11562138).

Almost surely, 2^67720971 is an apocalyptic number.

67720971 is a deficient number, since it is larger than the sum of its proper divisors (24776133).

67720971 is a wasteful number, since it uses less digits than its factorization.

67720971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550621.

The product of its (nonzero) digits is 37044, while the sum is 39.

The square root of 67720971 is about 8229.2752414778. The cubic root of 67720971 is about 407.6064604478.

The spelling of 67720971 in words is "sixty-seven million, seven hundred twenty thousand, nine hundred seventy-one".