6531978 has 24 divisors (see below), whose sum is σ = 13881312. Its totient is φ = 2048704.

The previous prime is 6531971. The next prime is 6531983. The reversal of 6531978 is 8791356.

It is not an unprimeable number, because it can be changed into a prime (6531971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150 + ... + 3617.

It is an arithmetic number, because the mean of its divisors is an integer number (578388).

Almost surely, 2^6531978 is an apocalyptic number.

6531978 is an abundant number, since it is smaller than the sum of its proper divisors (7349334).

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

6531978 is a wasteful number, since it uses less digits than its factorization.

6531978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806 (or 3789 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 6531978 is about 2555.7734641396. The cubic root of 6531978 is about 186.9311040966.

The spelling of 6531978 in words is "six million, five hundred thirty-one thousand, nine hundred seventy-eight".