78289417 has 4 divisors (see below), whose sum is σ = 78406420. Its totient is φ = 78172416.

The previous prime is 78289411. The next prime is 78289441. The reversal of 78289417 is 71498287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71498287 = 7 ⋅10214041.

It can be written as a sum of positive squares in 2 ways, for example, as 56190016 + 22099401 = 7496^2 + 4701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78289417 is a prime.

It is a super-2 number, since 2×78289417² = 12258465628399778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78289411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57492 + ... + 58837.

It is an arithmetic number, because the mean of its divisors is an integer number (19601605).

Almost surely, 2^78289417 is an apocalyptic number.

It is an amenable number.

78289417 is a deficient number, since it is larger than the sum of its proper divisors (117003).

78289417 is a wasteful number, since it uses less digits than its factorization.

78289417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117002.

The product of its digits is 225792, while the sum is 46.

The square root of 78289417 is about 8848.1307065391. The cubic root of 78289417 is about 427.7936689261.

The spelling of 78289417 in words is "seventy-eight million, two hundred eighty-nine thousand, four hundred seventeen".