78729384 has 16 divisors (see below), whose sum is σ = 196823520. Its totient is φ = 26243120.

The previous prime is 78729373. The next prime is 78729419. The reversal of 78729384 is 48392787.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640172 + ... + 1640219.

It is an arithmetic number, because the mean of its divisors is an integer number (12301470).

Almost surely, 2^78729384 is an apocalyptic number.

It is an amenable number.

78729384 is an abundant number, since it is smaller than the sum of its proper divisors (118094136).

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

78729384 is a wasteful number, since it uses less digits than its factorization.

78729384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280400 (or 3280396 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 78729384 is about 8872.9580186091. The cubic root of 78729384 is about 428.5935370182.

The spelling of 78729384 in words is "seventy-eight million, seven hundred twenty-nine thousand, three hundred eighty-four".