3200640 has 64 divisors (see below), whose sum is σ = 10208160. Its totient is φ = 852992.

The previous prime is 3200629. The next prime is 3200663. The reversal of 3200640 is 460023.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087 + ... + 2753.

Almost surely, 2^3200640 is an apocalyptic number.

3200640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3200640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5104080).

3200640 is an abundant number, since it is smaller than the sum of its proper divisors (7007520).

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

3200640 is a wasteful number, since it uses less digits than its factorization.

3200640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689 (or 1677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 3200640 is about 1789.0332584947. The cubic root of 3200640 is about 147.3710833747.

Adding to 3200640 its reverse (460023), we get a palindrome (3660663).

The spelling of 3200640 in words is "three million, two hundred thousand, six hundred forty".