1002660640 has 24 divisors (see below), whose sum is σ = 2368786140. Its totient is φ = 401064192.

The previous prime is 1002660613. The next prime is 1002660649. The reversal of 1002660640 is 460662001.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1001342736 + 1317904 = 31644^2 + 1148^2 .

It is not an unprimeable number, because it can be changed into a prime (1002660649) 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, 3133155 + ... + 3133474.

Almost surely, 2^1002660640 is an apocalyptic number.

1002660640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1002660640 is an abundant number, since it is smaller than the sum of its proper divisors (1366125500).

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

1002660640 is an equidigital number, since it uses as much as digits as its factorization.

1002660640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6266644 (or 6266636 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1002660640 is about 31664.8170687910. The cubic root of 1002660640 is about 1000.8860946044.

The spelling of 1002660640 in words is "one billion, two million, six hundred sixty thousand, six hundred forty".