78410809 has 8 divisors (see below), whose sum is σ = 81279360. Its totient is φ = 75553296.

The previous prime is 78410779. The next prime is 78410821. The reversal of 78410809 is 90801487.

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 78410809 - 2¹¹ = 78408761 is a prime.

It is a super-2 number, since 2×78410809² = 12296509936068962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78410879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13392 + ... + 18334.

It is an arithmetic number, because the mean of its divisors is an integer number (10159920).

Almost surely, 2^78410809 is an apocalyptic number.

It is an amenable number.

78410809 is a deficient number, since it is larger than the sum of its proper divisors (2868551).

78410809 is a wasteful number, since it uses less digits than its factorization.

78410809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 78410809 is about 8854.9878034924. The cubic root of 78410809 is about 428.0146605308.

The spelling of 78410809 in words is "seventy-eight million, four hundred ten thousand, eight hundred nine".