78471664 has 20 divisors (see below), whose sum is σ = 156944320. Its totient is φ = 37969920.

The previous prime is 78471661. The next prime is 78471667. The reversal of 78471664 is 46617487.

It is an interprime number because it is at equal distance from previous prime (78471661) and next prime (78471667).

78471664 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 78471664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78471661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78609 + ... + 79600.

It is an arithmetic number, because the mean of its divisors is an integer number (7847216).

Almost surely, 2^78471664 is an apocalyptic number.

It is an amenable number.

78471664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78471664 is a wasteful number, since it uses less digits than its factorization.

78471664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158248 (or 158242 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 78471664 is about 8858.4233360119. The cubic root of 78471664 is about 428.1253599656.

The spelling of 78471664 in words is "seventy-eight million, four hundred seventy-one thousand, six hundred sixty-four".