3257640 has 48 divisors (see below), whose sum is σ = 10588500. Its totient is φ = 868608.

The previous prime is 3257623. The next prime is 3257641. The reversal of 3257640 is 467523.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3218436 + 39204 = 1794^2 + 198^2 .

It is a super-2 number, since 2×3257640² = 21224436739200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3257641) 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, 4165 + ... + 4884.

Almost surely, 2^3257640 is an apocalyptic number.

3257640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3257640 is an abundant number, since it is smaller than the sum of its proper divisors (7330860).

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

3257640 is a wasteful number, since it uses less digits than its factorization.

3257640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9066 (or 9059 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 3257640 is about 1804.8933486497. The cubic root of 3257640 is about 148.2407816652.

The spelling of 3257640 in words is "three million, two hundred fifty-seven thousand, six hundred forty".