78287385720 has 32 divisors (see below), whose sum is σ = 234862157520. Its totient is φ = 20876636160.

The previous prime is 78287385719. The next prime is 78287385721. The reversal of 78287385720 is 2758378287.

It is an interprime number because it is at equal distance from previous prime (78287385719) and next prime (78287385721).

It is a super-2 number, since 2×78287385720² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78287385721) by changing a digit.

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, 326197321 + ... + 326197560.

Almost surely, 2^78287385720 is an apocalyptic number.

It is an amenable number.

78287385720 is an abundant number, since it is smaller than the sum of its proper divisors (156574771800).

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

78287385720 is a wasteful number, since it uses less digits than its factorization.

78287385720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652394895 (or 652394891 counting only the distinct ones).

The product of its (nonzero) digits is 10536960, while the sum is 57.

The spelling of 78287385720 in words is "seventy-eight billion, two hundred eighty-seven million, three hundred eighty-five thousand, seven hundred twenty".