8091978 has 16 divisors (see below), whose sum is σ = 16230240. Its totient is φ = 2689616.

The previous prime is 8091973. The next prime is 8091991. The reversal of 8091978 is 8791908.

It is not an unprimeable number, because it can be changed into a prime (8091973) 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, 601 + ... + 4067.

It is an arithmetic number, because the mean of its divisors is an integer number (1014390).

Almost surely, 2^8091978 is an apocalyptic number.

8091978 is an abundant number, since it is smaller than the sum of its proper divisors (8138262).

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

8091978 is a wasteful number, since it uses less digits than its factorization.

8091978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 8091978 is about 2844.6402232971. The cubic root of 8091978 is about 200.7635644700.

The spelling of 8091978 in words is "eight million, ninety-one thousand, nine hundred seventy-eight".