78647320 has 32 divisors (see below), whose sum is σ = 177286320. Its totient is φ = 31400320.

The previous prime is 78647299. The next prime is 78647323. The reversal of 78647320 is 2374687.

It is a self number, because there is not a number n which added to its sum of digits gives 78647320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78647323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24615 + ... + 27625.

Almost surely, 2^78647320 is an apocalyptic number.

It is an amenable number.

78647320 is an abundant number, since it is smaller than the sum of its proper divisors (98639000).

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

78647320 is a wasteful number, since it uses less digits than its factorization.

78647320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675 (or 3671 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 78647320 is about 8868.3324249827. The cubic root of 78647320 is about 428.4445696487. Note that the first 3 decimals are identical.

The spelling of 78647320 in words is "seventy-eight million, six hundred forty-seven thousand, three hundred twenty".