78217361 has 4 divisors (see below), whose sum is σ = 78277632. Its totient is φ = 78157092.

The previous prime is 78217333. The next prime is 78217367. The reversal of 78217361 is 16371287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78217361 - 2¹⁴ = 78200977 is a prime.

It is a super-2 number, since 2×78217361² = 12235911123608642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78217367) 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, 28145 + ... + 30798.

It is an arithmetic number, because the mean of its divisors is an integer number (19569408).

Almost surely, 2^78217361 is an apocalyptic number.

It is an amenable number.

78217361 is a deficient number, since it is larger than the sum of its proper divisors (60271).

78217361 is a wasteful number, since it uses less digits than its factorization.

78217361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60270.

The product of its digits is 14112, while the sum is 35.

The square root of 78217361 is about 8844.0579487021. The cubic root of 78217361 is about 427.6623844198.

The spelling of 78217361 in words is "seventy-eight million, two hundred seventeen thousand, three hundred sixty-one".