67720865 has 8 divisors (see below), whose sum is σ = 82410048. Its totient is φ = 53413360.

The previous prime is 67720847. The next prime is 67720879. The reversal of 67720865 is 56802776.

It is a happy number.

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

It is not a de Polignac number, because 67720865 - 2²⁴ = 50943649 is a prime.

It is a super-2 number, since 2×67720865² = 9172231112696450, 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, 95027 + ... + 95736.

It is an arithmetic number, because the mean of its divisors is an integer number (10301256).

Almost surely, 2^67720865 is an apocalyptic number.

It is an amenable number.

67720865 is a deficient number, since it is larger than the sum of its proper divisors (14689183).

67720865 is a wasteful number, since it uses less digits than its factorization.

67720865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190839.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 67720865 is about 8229.2688010540. The cubic root of 67720865 is about 407.6062477795.

The spelling of 67720865 in words is "sixty-seven million, seven hundred twenty thousand, eight hundred sixty-five".