2638426756 has 18 divisors (see below), whose sum is σ = 5371083438. Its totient is φ = 1130754240.

The previous prime is 2638426751. The next prime is 2638426801. The reversal of 2638426756 is 6576248362.

It can be written as a sum of positive squares in only one way, i.e., 2324782656 + 313644100 = 48216^2 + 17710^2 .

It is a super-2 number, since 2×2638426756² = 13922591493553367072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (2638426751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6730485 + ... + 6730876.

Almost surely, 2^2638426756 is an apocalyptic number.

It is an amenable number.

2638426756 is an abundant number, since it is smaller than the sum of its proper divisors (2732656682).

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

2638426756 is a wasteful number, since it uses less digits than its factorization.

2638426756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13461379 (or 13461370 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 49.

The square root of 2638426756 is about 51365.6184232216. The cubic root of 2638426756 is about 1381.8100515025.

The spelling of 2638426756 in words is "two billion, six hundred thirty-eight million, four hundred twenty-six thousand, seven hundred fifty-six".