78020417 has 8 divisors (see below), whose sum is σ = 80083080. Its totient is φ = 75965440.

The previous prime is 78020407. The next prime is 78020473. The reversal of 78020417 is 71402087.

It can be written as a sum of positive squares in 4 ways, for example, as 3094081 + 74926336 = 1759^2 + 8656^2 .

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 78020417 - 2⁴ = 78020401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78020417.

It is not an unprimeable number, because it can be changed into a prime (78020407) 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, 22709 + ... + 25917.

It is an arithmetic number, because the mean of its divisors is an integer number (10010385).

Almost surely, 2^78020417 is an apocalyptic number.

It is an amenable number.

78020417 is a deficient number, since it is larger than the sum of its proper divisors (2062663).

78020417 is a wasteful number, since it uses less digits than its factorization.

78020417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3843.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 78020417 is about 8832.9166757080. The cubic root of 78020417 is about 427.3031447775.

The spelling of 78020417 in words is "seventy-eight million, twenty thousand, four hundred seventeen".