78242999 has 4 divisors (see below), whose sum is σ = 79719336. Its totient is φ = 76766664.

The previous prime is 78242981. The next prime is 78243017. The reversal of 78242999 is 99924287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99924287 = 19 ⋅5259173.

It is an interprime number because it is at equal distance from previous prime (78242981) and next prime (78243017).

It is a cyclic number.

It is not a de Polignac number, because 78242999 - 2⁸ = 78242743 is a prime.

It is a super-2 number, since 2×78242999² = 12243933785028002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78242599) 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, 738089 + ... + 738194.

It is an arithmetic number, because the mean of its divisors is an integer number (19929834).

Almost surely, 2^78242999 is an apocalyptic number.

78242999 is a deficient number, since it is larger than the sum of its proper divisors (1476337).

78242999 is a wasteful number, since it uses less digits than its factorization.

78242999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476336.

The product of its digits is 653184, while the sum is 50.

The square root of 78242999 is about 8845.5072777088. The cubic root of 78242999 is about 427.7091055497.

The spelling of 78242999 in words is "seventy-eight million, two hundred forty-two thousand, nine hundred ninety-nine".