2638402456 has 8 divisors (see below), whose sum is σ = 4947004620. Its totient is φ = 1319201224.

The previous prime is 2638402441. The next prime is 2638402457. The reversal of 2638402456 is 6542048362.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×2638402456² = 13922335039653663872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638402457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164900146 + ... + 164900161.

Almost surely, 2^2638402456 is an apocalyptic number.

It is an amenable number.

2638402456 is a deficient number, since it is larger than the sum of its proper divisors (2308602164).

2638402456 is a wasteful number, since it uses less digits than its factorization.

2638402456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329800313 (or 329800309 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The square root of 2638402456 is about 51365.3818831321. The cubic root of 2638402456 is about 1381.8058093169.

The spelling of 2638402456 in words is "two billion, six hundred thirty-eight million, four hundred two thousand, four hundred fifty-six".