78257882837 has 4 divisors (see below), whose sum is σ = 78288927756. Its totient is φ = 78226837920.

The previous prime is 78257882827. The next prime is 78257882851. The reversal of 78257882837 is 73828875287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73828875287 = 4159 ⋅17751593.

It can be written as a sum of positive squares in 2 ways, for example, as 176199076 + 78081683761 = 13274^2 + 279431^2 .

It is a cyclic number.

It is not a de Polignac number, because 78257882837 - 2¹⁶ = 78257817301 is a prime.

It is a super-2 number, since 2×78257882837² (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 (78257882827) 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, 15518678 + ... + 15523719.

It is an arithmetic number, because the mean of its divisors is an integer number (19572231939).

Almost surely, 2^78257882837 is an apocalyptic number.

It is an amenable number.

78257882837 is a deficient number, since it is larger than the sum of its proper divisors (31044919).

78257882837 is a wasteful number, since it uses less digits than its factorization.

78257882837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31044918.

The product of its digits is 84295680, while the sum is 65.

The spelling of 78257882837 in words is "seventy-eight billion, two hundred fifty-seven million, eight hundred eighty-two thousand, eight hundred thirty-seven".