7643121426 has 24 divisors (see below), whose sum is σ = 17534220444. Its totient is φ = 2397841920.

The previous prime is 7643121407. The next prime is 7643121457. The reversal of 7643121426 is 6241213467.

7643121426 is a `hidden beast` number, since 7 + 6 + 431 + 214 + 2 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7241159025 + 401962401 = 85095^2 + 20049^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12488455 + ... + 12489066.

Almost surely, 2^7643121426 is an apocalyptic number.

7643121426 is an abundant number, since it is smaller than the sum of its proper divisors (9891099018).

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

7643121426 is a wasteful number, since it uses less digits than its factorization.

7643121426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24977546 (or 24977543 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 7643121426 is about 87424.9473891749. The cubic root of 7643121426 is about 1969.8065916783.

The spelling of 7643121426 in words is "seven billion, six hundred forty-three million, one hundred twenty-one thousand, four hundred twenty-six".