78954517 has 4 divisors (see below), whose sum is σ = 79050816. Its totient is φ = 78858220.

The previous prime is 78954509. The next prime is 78954521. The reversal of 78954517 is 71545987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71545987 = 29 ⋅2467103.

It is a cyclic number.

It is not a de Polignac number, because 78954517 - 2³ = 78954509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78954017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46909 + ... + 48562.

It is an arithmetic number, because the mean of its divisors is an integer number (19762704).

Almost surely, 2^78954517 is an apocalyptic number.

It is an amenable number.

78954517 is a deficient number, since it is larger than the sum of its proper divisors (96299).

78954517 is an equidigital number, since it uses as much as digits as its factorization.

78954517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96298.

The product of its digits is 352800, while the sum is 46.

The square root of 78954517 is about 8885.6354302886. The cubic root of 78954517 is about 429.0016807783.

The spelling of 78954517 in words is "seventy-eight million, nine hundred fifty-four thousand, five hundred seventeen".