1000700640 has 144 divisors (see below), whose sum is σ = 3423092400. Its totient is φ = 266213376.

The previous prime is 1000700621. The next prime is 1000700693. The reversal of 1000700640 is 460070001.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1164531 + ... + 1165389.

It is an arithmetic number, because the mean of its divisors is an integer number (23771475).

Almost surely, 2^1000700640 is an apocalyptic number.

1000700640 is a gapful number since it is divisible by the number (10) 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 1000700640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711546200).

1000700640 is an abundant number, since it is smaller than the sum of its proper divisors (2422391760).

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

1000700640 is a wasteful number, since it uses less digits than its factorization.

1000700640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1000700640 is about 31633.8527530239. The cubic root of 1000700640 is about 1000.2334921438.

Adding to 1000700640 its reverse (460070001), we get a palindrome (1460770641).

The spelling of 1000700640 in words is "one billion, seven hundred thousand, six hundred forty".