78263779539 has 16 divisors (see below), whose sum is σ = 113914851840. Its totient is φ = 47400665760.

The previous prime is 78263779423. The next prime is 78263779543. The reversal of 78263779539 is 93597736287.

It is not a de Polignac number, because 78263779539 - 2⁷ = 78263779411 is a prime.

It is a super-2 number, since 2×78263779539² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78263779539.

It is not an unprimeable number, because it can be changed into a prime (78263779639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 748384 + ... + 846525.

It is an arithmetic number, because the mean of its divisors is an integer number (7119678240).

Almost surely, 2^78263779539 is an apocalyptic number.

78263779539 is a deficient number, since it is larger than the sum of its proper divisors (35651072301).

78263779539 is a wasteful number, since it uses less digits than its factorization.

78263779539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596410.

The product of its digits is 120022560, while the sum is 66.

The spelling of 78263779539 in words is "seventy-eight billion, two hundred sixty-three million, seven hundred seventy-nine thousand, five hundred thirty-nine".