8491878 has 48 divisors (see below), whose sum is σ = 19380816. Its totient is φ = 2786400.

The previous prime is 8491831. The next prime is 8491897. The reversal of 8491878 is 8781948.

It is a super-2 number, since 2×8491878² = 144223983933768, which contains 22 as substring.

It is a congruent number.

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, 49000 + ... + 49172.

It is an arithmetic number, because the mean of its divisors is an integer number (403767).

Almost surely, 2^8491878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8491878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9690408).

8491878 is an abundant number, since it is smaller than the sum of its proper divisors (10888938).

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

8491878 is a wasteful number, since it uses less digits than its factorization.

8491878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 279 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 8491878 is about 2914.0827030131. The cubic root of 8491878 is about 204.0177320227.

The spelling of 8491878 in words is "eight million, four hundred ninety-one thousand, eight hundred seventy-eight".