67720771 has 8 divisors (see below), whose sum is σ = 72316800. Its totient is φ = 63275520.

The previous prime is 67720753. The next prime is 67720781. The reversal of 67720771 is 17702776.

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 67720771 - 2⁵ = 67720739 is a prime.

It is a super-2 number, since 2×67720771² = 9172205649668882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67720771.

It is not an unprimeable number, because it can be changed into a prime (67720711) 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, 36766 + ... + 38563.

It is an arithmetic number, because the mean of its divisors is an integer number (9039600).

Almost surely, 2^67720771 is an apocalyptic number.

67720771 is a deficient number, since it is larger than the sum of its proper divisors (4596029).

67720771 is a wasteful number, since it uses less digits than its factorization.

67720771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75389.

The product of its (nonzero) digits is 28812, while the sum is 37.

The square root of 67720771 is about 8229.2630897305. The cubic root of 67720771 is about 407.6060591867.

The spelling of 67720771 in words is "sixty-seven million, seven hundred twenty thousand, seven hundred seventy-one".