6469640 has 16 divisors (see below), whose sum is σ = 14556780. Its totient is φ = 2587840.

The previous prime is 6469637. The next prime is 6469649. The reversal of 6469640 is 469646.

It can be written as a sum of positive squares in 2 ways, for example, as 6180196 + 289444 = 2486^2 + 538^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6469640.

It is not an unprimeable number, because it can be changed into a prime (6469649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80831 + ... + 80910.

Almost surely, 2^6469640 is an apocalyptic number.

It is an amenable number.

6469640 is an abundant number, since it is smaller than the sum of its proper divisors (8087140).

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

6469640 is a wasteful number, since it uses less digits than its factorization.

6469640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161752 (or 161748 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 6469640 is about 2543.5487021089. The cubic root of 6469640 is about 186.3345426435.

The spelling of 6469640 in words is "six million, four hundred sixty-nine thousand, six hundred forty".