2639640890 has 16 divisors (see below), whose sum is σ = 4752933120. Its totient is φ = 1055505360.

The previous prime is 2639640889. The next prime is 2639640907. The reversal of 2639640890 is 980469362.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11126 + ... + 73505.

It is an arithmetic number, because the mean of its divisors is an integer number (297058320).

Almost surely, 2^2639640890 is an apocalyptic number.

2639640890 is a deficient number, since it is larger than the sum of its proper divisors (2113292230).

2639640890 is a wasteful number, since it uses less digits than its factorization.

2639640890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87757.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 2639640890 is about 51377.4356113654. The cubic root of 2639640890 is about 1382.0219764412.

The spelling of 2639640890 in words is "two billion, six hundred thirty-nine million, six hundred forty thousand, eight hundred ninety".