2638730440 has 16 divisors (see below), whose sum is σ = 5937143580. Its totient is φ = 1055492160.

The previous prime is 2638730399. The next prime is 2638730459. The reversal of 2638730440 is 440378362.

It is a happy number.

2638730440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2553685156 + 85045284 = 50534^2 + 9222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2638730440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32984091 + ... + 32984170.

Almost surely, 2^2638730440 is an apocalyptic number.

2638730440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2638730440 is an abundant number, since it is smaller than the sum of its proper divisors (3298413140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2638730440 is a wasteful number, since it uses less digits than its factorization.

2638730440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65968272 (or 65968268 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 2638730440 is about 51368.5744400212. The cubic root of 2638730440 is about 1381.8630651028.

The spelling of 2638730440 in words is "two billion, six hundred thirty-eight million, seven hundred thirty thousand, four hundred forty".