78948457 has 18 divisors (see below), whose sum is σ = 93583854. Its totient is φ = 66407040.

The previous prime is 78948451. The next prime is 78948461. The reversal of 78948457 is 75484987.

It can be written as a sum of positive squares in 3 ways, for example, as 13920361 + 65028096 = 3731^2 + 8064^2 .

It is not a de Polignac number, because 78948457 - 2²³ = 70559849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78948451) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 182113 + ... + 182545.

It is an arithmetic number, because the mean of its divisors is an integer number (5199103).

Almost surely, 2^78948457 is an apocalyptic number.

It is an amenable number.

78948457 is a deficient number, since it is larger than the sum of its proper divisors (14635397).

78948457 is an equidigital number, since it uses as much as digits as its factorization.

78948457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 501 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 52.

The square root of 78948457 is about 8885.2944239344. The cubic root of 78948457 is about 428.9907047683.

The spelling of 78948457 in words is "seventy-eight million, nine hundred forty-eight thousand, four hundred fifty-seven".