72878687827 has 4 divisors (see below), whose sum is σ = 79504023096. Its totient is φ = 66253352560.

The previous prime is 72878687747. The next prime is 72878687881.

It is a happy number.

72878687827 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72878687827 is a prime.

It is a super-2 number, since 2×72878687827² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72878687227) 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, 3312667618 + ... + 3312667639.

It is an arithmetic number, because the mean of its divisors is an integer number (19876005774).

Almost surely, 2^72878687827 is an apocalyptic number.

72878687827 is a deficient number, since it is larger than the sum of its proper divisors (6625335269).

72878687827 is a wasteful number, since it uses less digits than its factorization.

72878687827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6625335268.

The product of its digits is 236027904, while the sum is 70.

The spelling of 72878687827 in words is "seventy-two billion, eight hundred seventy-eight million, six hundred eighty-seven thousand, eight hundred twenty-seven".