78563617 has 8 divisors (see below), whose sum is σ = 88022592. Its totient is φ = 69490800.

The previous prime is 78563599. The next prime is 78563621. The reversal of 78563617 is 71636587.

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 78563617 - 2⁷ = 78563489 is a prime.

It is a super-2 number, since 2×78563617² = 12344483832245378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78563627) 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, 96109 + ... + 96922.

It is an arithmetic number, because the mean of its divisors is an integer number (11002824).

Almost surely, 2^78563617 is an apocalyptic number.

It is an amenable number.

78563617 is a deficient number, since it is larger than the sum of its proper divisors (9458975).

78563617 is a wasteful number, since it uses less digits than its factorization.

78563617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193079.

The product of its digits is 211680, while the sum is 43.

The square root of 78563617 is about 8863.6119612718. The cubic root of 78563617 is about 428.2925202811.

The spelling of 78563617 in words is "seventy-eight million, five hundred sixty-three thousand, six hundred seventeen".