78577217 has 8 divisors (see below), whose sum is σ = 84274560. Its totient is φ = 73036080.

The previous prime is 78577207. The next prime is 78577231. The reversal of 78577217 is 71277587.

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 78577217 - 2⁴ = 78577201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78577207) 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, 38009 + ... + 40022.

It is an arithmetic number, because the mean of its divisors is an integer number (10534320).

Almost surely, 2^78577217 is an apocalyptic number.

It is an amenable number.

78577217 is a deficient number, since it is larger than the sum of its proper divisors (5697343).

78577217 is a wasteful number, since it uses less digits than its factorization.

78577217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78103.

The product of its digits is 192080, while the sum is 44.

The square root of 78577217 is about 8864.3791096726. The cubic root of 78577217 is about 428.3172324928.

The spelling of 78577217 in words is "seventy-eight million, five hundred seventy-seven thousand, two hundred seventeen".