78763780 has 24 divisors (see below), whose sum is σ = 165856320. Its totient is φ = 31419360.

The previous prime is 78763733. The next prime is 78763781. The reversal of 78763780 is 8736787.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 78763780.

It is not an unprimeable number, because it can be changed into a prime (78763781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2385 + ... + 12775.

It is an arithmetic number, because the mean of its divisors is an integer number (6910680).

Almost surely, 2^78763780 is an apocalyptic number.

It is an amenable number.

78763780 is an abundant number, since it is smaller than the sum of its proper divisors (87092540).

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

78763780 is a wasteful number, since it uses less digits than its factorization.

78763780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10779 (or 10777 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 78763780 is about 8874.8960557293. The cubic root of 78763780 is about 428.6559438614.

The spelling of 78763780 in words is "seventy-eight million, seven hundred sixty-three thousand, seven hundred eighty".