78101720 has 32 divisors (see below), whose sum is σ = 180018720. Its totient is φ = 30478080.

The previous prime is 78101713. The next prime is 78101731. The reversal of 78101720 is 2710187.

It is a self number, because there is not a number n which added to its sum of digits gives 78101720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22172 + ... + 25451.

It is an arithmetic number, because the mean of its divisors is an integer number (5625585).

Almost surely, 2^78101720 is an apocalyptic number.

It is an amenable number.

78101720 is an abundant number, since it is smaller than the sum of its proper divisors (101917000).

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

78101720 is a wasteful number, since it uses less digits than its factorization.

78101720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47675 (or 47671 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 78101720 is about 8837.5177510430. The cubic root of 78101720 is about 427.4515203281.

The spelling of 78101720 in words is "seventy-eight million, one hundred one thousand, seven hundred twenty".