78472447956 has 72 divisors (see below), whose sum is σ = 227964784320. Its totient is φ = 22295431296.

The previous prime is 78472447931. The next prime is 78472447961. The reversal of 78472447956 is 65974427487.

78472447956 is a `hidden beast` number, since 7 + 8 + 472 + 44 + 79 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 78472447893 and 78472447902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 824721 + ... + 914936.

It is an arithmetic number, because the mean of its divisors is an integer number (3166177560).

Almost surely, 2^78472447956 is an apocalyptic number.

It is an amenable number.

78472447956 is an abundant number, since it is smaller than the sum of its proper divisors (149492336364).

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

78472447956 is a wasteful number, since it uses less digits than its factorization.

78472447956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739853 (or 1739848 counting only the distinct ones).

The product of its digits is 94832640, while the sum is 63.

The spelling of 78472447956 in words is "seventy-eight billion, four hundred seventy-two million, four hundred forty-seven thousand, nine hundred fifty-six".