2639987396 has 12 divisors (see below), whose sum is σ = 4620403452. Its totient is φ = 1319872128.

The previous prime is 2639987393. The next prime is 2639987419. The reversal of 2639987396 is 6937899362.

It can be written as a sum of positive squares in 2 ways, for example, as 828633796 + 1811353600 = 28786^2 + 42560^2 .

It is not an unprimeable number, because it can be changed into a prime (2639987393) 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, 33296 + ... + 79928.

It is an arithmetic number, because the mean of its divisors is an integer number (385033621).

Almost surely, 2^2639987396 is an apocalyptic number.

It is an amenable number.

2639987396 is a deficient number, since it is larger than the sum of its proper divisors (1980416056).

2639987396 is a wasteful number, since it uses less digits than its factorization.

2639987396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60790 (or 60788 counting only the distinct ones).

The product of its digits is 26453952, while the sum is 62.

The square root of 2639987396 is about 51380.8076620055. The cubic root of 2639987396 is about 1382.0824465297.

The spelling of 2639987396 in words is "two billion, six hundred thirty-nine million, nine hundred eighty-seven thousand, three hundred ninety-six".