2142642640 has 20 divisors (see below), whose sum is σ = 4981644324. Its totient is φ = 857057024.

The previous prime is 2142642631. The next prime is 2142642659. The reversal of 2142642640 is 462462412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1662682176 + 479960464 = 40776^2 + 21908^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 13391437 + ... + 13391596.

Almost surely, 2^2142642640 is an apocalyptic number.

2142642640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2142642640 is an abundant number, since it is smaller than the sum of its proper divisors (2839001684).

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

2142642640 is a wasteful number, since it uses less digits than its factorization.

2142642640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26783046 (or 26783040 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 2142642640 is about 46288.6880349832. The cubic root of 2142642640 is about 1289.1889700068.

The spelling of 2142642640 in words is "two billion, one hundred forty-two million, six hundred forty-two thousand, six hundred forty".