78142817439 has 24 divisors (see below), whose sum is σ = 115313215680. Its totient is φ = 50969683968.

The previous prime is 78142817437. The next prime is 78142817497. The reversal of 78142817439 is 93471824187.

It is not a de Polignac number, because 78142817439 - 2¹ = 78142817437 is a prime.

It is a super-2 number, since 2×78142817439² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78142817437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1297507 + ... + 1356395.

It is an arithmetic number, because the mean of its divisors is an integer number (4804717320).

Almost surely, 2^78142817439 is an apocalyptic number.

78142817439 is a deficient number, since it is larger than the sum of its proper divisors (37170398241).

78142817439 is a wasteful number, since it uses less digits than its factorization.

78142817439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62079 (or 62076 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 78142817439 in words is "seventy-eight billion, one hundred forty-two million, eight hundred seventeen thousand, four hundred thirty-nine".