78999417 has 48 divisors (see below), whose sum is σ = 134742400. Its totient is φ = 44579808.

The previous prime is 78999413. The next prime is 78999421. The reversal of 78999417 is 71499987.

It is an interprime number because it is at equal distance from previous prime (78999413) and next prime (78999421).

It is not a de Polignac number, because 78999417 - 2² = 78999413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78999413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 484578 + ... + 484740.

Almost surely, 2^78999417 is an apocalyptic number.

It is an amenable number.

78999417 is a deficient number, since it is larger than the sum of its proper divisors (55742983).

78999417 is a wasteful number, since it uses less digits than its factorization.

78999417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 330 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 78999417 is about 8888.1616209428. The cubic root of 78999417 is about 429.0829871895.

The spelling of 78999417 in words is "seventy-eight million, nine hundred ninety-nine thousand, four hundred seventeen".