78618720 has 48 divisors (see below), whose sum is σ = 247650480. Its totient is φ = 20964864.

The previous prime is 78618719. The next prime is 78618763. The reversal of 78618720 is 2781687.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81415 + ... + 82374.

It is an arithmetic number, because the mean of its divisors is an integer number (5159385).

Almost surely, 2^78618720 is an apocalyptic number.

It is an amenable number.

78618720 is an abundant number, since it is smaller than the sum of its proper divisors (169031760).

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

78618720 is a wasteful number, since it uses less digits than its factorization.

78618720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163807 (or 163799 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 78618720 is about 8866.7197993396. The cubic root of 78618720 is about 428.3926289074.

The spelling of 78618720 in words is "seventy-eight million, six hundred eighteen thousand, seven hundred twenty".