1632640 has 32 divisors (see below), whose sum is σ = 3904560. Its totient is φ = 652800.

The previous prime is 1632637. The next prime is 1632647. The reversal of 1632640 is 462361.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1632647) 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, 636 + ... + 1915.

2^1632640 is an apocalyptic number.

1632640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1632640 is an abundant number, since it is smaller than the sum of its proper divisors (2271920).

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

1632640 is an equidigital number, since it uses as much as digits as its factorization.

1632640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570 (or 2558 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1632640 is about 1277.7480189771. The cubic root of 1632640 is about 117.7506945624.

The spelling of 1632640 in words is "one million, six hundred thirty-two thousand, six hundred forty".