78720080 has 40 divisors (see below), whose sum is σ = 183750144. Its totient is φ = 31363200.

The previous prime is 78720079. The next prime is 78720151. The reversal of 78720080 is 8002787.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 19865 + ... + 23495.

Almost surely, 2^78720080 is an apocalyptic number.

It is an amenable number.

78720080 is an abundant number, since it is smaller than the sum of its proper divisors (105030064).

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

78720080 is a wasteful number, since it uses less digits than its factorization.

78720080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915 (or 3909 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 78720080 is about 8872.4337134746. The cubic root of 78720080 is about 428.5766530580.

The spelling of 78720080 in words is "seventy-eight million, seven hundred twenty thousand, eighty".