2639846642 has 16 divisors (see below), whose sum is σ = 3973182720. Its totient is φ = 1315461168.

The previous prime is 2639846621. The next prime is 2639846647. The reversal of 2639846642 is 2466489362.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2639846647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 859193 + ... + 862259.

It is an arithmetic number, because the mean of its divisors is an integer number (248323920).

Almost surely, 2^2639846642 is an apocalyptic number.

2639846642 is a deficient number, since it is larger than the sum of its proper divisors (1333336078).

2639846642 is a wasteful number, since it uses less digits than its factorization.

2639846642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385.

The product of its digits is 2985984, while the sum is 50.

The square root of 2639846642 is about 51379.4379299735. The cubic root of 2639846642 is about 1382.0578836485.

The spelling of 2639846642 in words is "two billion, six hundred thirty-nine million, eight hundred forty-six thousand, six hundred forty-two".