1024640 has 32 divisors (see below), whose sum is σ = 2451060. Its totient is φ = 409600.

The previous prime is 1024633. The next prime is 1024663. The reversal of 1024640 is 464201.

It can be written as a sum of positive squares in 2 ways, for example, as 937024 + 87616 = 968^2 + 296^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161 + ... + 1440.

2^1024640 is an apocalyptic number.

1024640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1024640 is an abundant number, since it is smaller than the sum of its proper divisors (1426420).

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

1024640 is an equidigital number, since it uses as much as digits as its factorization.

1024640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1024640 is about 1012.2450296247. The cubic root of 1024640 is about 100.8146783025.

Adding to 1024640 its reverse (464201), we get a palindrome (1488841).

The spelling of 1024640 in words is "one million, twenty-four thousand, six hundred forty".