6491878 has 4 divisors (see below), whose sum is σ = 9737820. Its totient is φ = 3245938.

The previous prime is 6491873. The next prime is 6491893. The reversal of 6491878 is 8781946.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1622968 + ... + 1622971.

It is an arithmetic number, because the mean of its divisors is an integer number (2434455).

Almost surely, 2^6491878 is an apocalyptic number.

6491878 is a deficient number, since it is larger than the sum of its proper divisors (3245942).

6491878 is a wasteful number, since it uses less digits than its factorization.

6491878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245941.

The product of its digits is 96768, while the sum is 43.

The square root of 6491878 is about 2547.9164036522. The cubic root of 6491878 is about 186.5477935045.

The spelling of 6491878 in words is "six million, four hundred ninety-one thousand, eight hundred seventy-eight".