2638278001 has 4 divisors (see below), whose sum is σ = 2638576192. Its totient is φ = 2637979812.

The previous prime is 2638277981. The next prime is 2638278011. The reversal of 2638278001 is 1008728362.

2638278001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1008728362 = 2 ⋅504364181.

It is a cyclic number.

It is not a de Polignac number, because 2638278001 - 2¹¹ = 2638275953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638278011) 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, 135405 + ... + 153658.

It is an arithmetic number, because the mean of its divisors is an integer number (659644048).

Almost surely, 2^2638278001 is an apocalyptic number.

It is an amenable number.

2638278001 is a deficient number, since it is larger than the sum of its proper divisors (298191).

2638278001 is an equidigital number, since it uses as much as digits as its factorization.

2638278001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298190.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 2638278001 is about 51364.1704011658. The cubic root of 2638278001 is about 1381.7840821103.

The spelling of 2638278001 in words is "two billion, six hundred thirty-eight million, two hundred seventy-eight thousand, one".