78745380 has 72 divisors (see below), whose sum is σ = 252568512. Its totient is φ = 17957376.

The previous prime is 78745349. The next prime is 78745397. The reversal of 78745380 is 8354787.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 181644 + ... + 182076.

It is an arithmetic number, because the mean of its divisors is an integer number (3507896).

Almost surely, 2^78745380 is an apocalyptic number.

78745380 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78745380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126284256).

78745380 is an abundant number, since it is smaller than the sum of its proper divisors (173823132).

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

78745380 is a wasteful number, since it uses less digits than its factorization.

78745380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 78745380 is about 8873.8593633210. The cubic root of 78745380 is about 428.6225618355.

The spelling of 78745380 in words is "seventy-eight million, seven hundred forty-five thousand, three hundred eighty".