2638990549 has 8 divisors (see below), whose sum is σ = 2860093880. Its totient is φ = 2420473536.

The previous prime is 2638990547. The next prime is 2638990567. The reversal of 2638990549 is 9450998362.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41049649 + 2597940900 = 6407^2 + 50970^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2638990549 - 2¹ = 2638990547 is a prime.

It is a super-2 number, since 2×2638990549² = 13928542235422642802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2638990549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638990547) 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, 644454 + ... + 648535.

It is an arithmetic number, because the mean of its divisors is an integer number (357511735).

Almost surely, 2^2638990549 is an apocalyptic number.

It is an amenable number.

2638990549 is a deficient number, since it is larger than the sum of its proper divisors (221103331).

2638990549 is a wasteful number, since it uses less digits than its factorization.

2638990549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293159.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The square root of 2638990549 is about 51371.1061687404. The cubic root of 2638990549 is about 1381.9084686556.

The spelling of 2638990549 in words is "two billion, six hundred thirty-eight million, nine hundred ninety thousand, five hundred forty-nine".