78287651556 has 24 divisors (see below), whose sum is σ = 187126582944. Its totient is φ = 25459398720.

The previous prime is 78287651543. The next prime is 78287651569. The reversal of 78287651556 is 65515678287.

It is an interprime number because it is at equal distance from previous prime (78287651543) and next prime (78287651569).

It is a super-2 number, since 2×78287651556² (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 78287651556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79560130 + ... + 79561113.

It is an arithmetic number, because the mean of its divisors is an integer number (7796940956).

Almost surely, 2^78287651556 is an apocalyptic number.

It is an amenable number.

78287651556 is an abundant number, since it is smaller than the sum of its proper divisors (108838931388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78287651556 is a wasteful number, since it uses less digits than its factorization.

78287651556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159121291 (or 159121289 counting only the distinct ones).

The product of its digits is 28224000, while the sum is 60.

The spelling of 78287651556 in words is "seventy-eight billion, two hundred eighty-seven million, six hundred fifty-one thousand, five hundred fifty-six".