78216601 has 8 divisors (see below), whose sum is σ = 80308224. Its totient is φ = 76142880.

The previous prime is 78216599. The next prime is 78216623. The reversal of 78216601 is 10661287.

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 78216601 - 2¹ = 78216599 is a prime.

It is a super-2 number, since 2×78216601² = 12235673343986402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78216101) 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, 4621 + ... + 13333.

It is an arithmetic number, because the mean of its divisors is an integer number (10038528).

Almost surely, 2^78216601 is an apocalyptic number.

It is an amenable number.

78216601 is a deficient number, since it is larger than the sum of its proper divisors (2091623).

78216601 is a wasteful number, since it uses less digits than its factorization.

78216601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8951.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 78216601 is about 8844.0149818959. The cubic root of 78216601 is about 427.6609992863.

Adding to 78216601 its reverse (10661287), we get a palindrome (88877888).

The spelling of 78216601 in words is "seventy-eight million, two hundred sixteen thousand, six hundred one".