78729380 has 72 divisors (see below), whose sum is σ = 179639208. Its totient is φ = 28966912.

The previous prime is 78729373. The next prime is 78729419. The reversal of 78729380 is 8392787.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 5866084 + 72863296 = 2422^2 + 8536^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306212 + ... + 306468.

It is an arithmetic number, because the mean of its divisors is an integer number (2494989).

Almost surely, 2^78729380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78729380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89819604).

78729380 is an abundant number, since it is smaller than the sum of its proper divisors (100909828).

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

78729380 is a wasteful number, since it uses less digits than its factorization.

78729380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 78729380 is about 8872.9577932051. The cubic root of 78729380 is about 428.5935297597.

The spelling of 78729380 in words is "seventy-eight million, seven hundred twenty-nine thousand, three hundred eighty".