8307978 has 64 divisors (see below), whose sum is σ = 20736000. Its totient is φ = 2165184.

The previous prime is 8307977. The next prime is 8307983. The reversal of 8307978 is 8797038.

8307978 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (8307977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22963 + ... + 23321.

It is an arithmetic number, because the mean of its divisors is an integer number (324000).

Almost surely, 2^8307978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8307978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10368000).

8307978 is an abundant number, since it is smaller than the sum of its proper divisors (12428022).

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

8307978 is a wasteful number, since it uses less digits than its factorization.

8307978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 8307978 is about 2882.3563277291. The cubic root of 8307978 is about 202.5342359430.

The spelling of 8307978 in words is "eight million, three hundred seven thousand, nine hundred seventy-eight".