78842252039 has 4 divisors (see below), whose sum is σ = 79579095624. Its totient is φ = 78105408456.

The previous prime is 78842251997. The next prime is 78842252081. The reversal of 78842252039 is 93025224887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93025224887 = 7 ⋅13289317841.

It is an interprime number because it is at equal distance from previous prime (78842251997) and next prime (78842252081).

It is a cyclic number.

It is not a de Polignac number, because 78842252039 - 2³⁶ = 10122775303 is a prime.

It is a super-2 number, since 2×78842252039² (a number of 23 digits) 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 (78842252239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368421632 + ... + 368421845.

It is an arithmetic number, because the mean of its divisors is an integer number (19894773906).

Almost surely, 2^78842252039 is an apocalyptic number.

78842252039 is a deficient number, since it is larger than the sum of its proper divisors (736843585).

78842252039 is a wasteful number, since it uses less digits than its factorization.

78842252039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736843584.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 78842252039 in words is "seventy-eight billion, eight hundred forty-two million, two hundred fifty-two thousand, thirty-nine".