8120661438 has 16 divisors (see below), whose sum is σ = 16325477136. Its totient is φ = 2692861440.

The previous prime is 8120661421. The next prime is 8120661449. The reversal of 8120661438 is 8341660218.

It is a junction number, because it is equal to n+sod(n) for n = 8120661396 and 8120661405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3505173 + ... + 3507488.

It is an arithmetic number, because the mean of its divisors is an integer number (1020342321).

Almost surely, 2^8120661438 is an apocalyptic number.

8120661438 is an abundant number, since it is smaller than the sum of its proper divisors (8204815698).

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

8120661438 is a wasteful number, since it uses less digits than its factorization.

8120661438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012859.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 8120661438 is about 90114.7126611410. The cubic root of 8120661438 is about 2010.0049864979.

The spelling of 8120661438 in words is "eight billion, one hundred twenty million, six hundred sixty-one thousand, four hundred thirty-eight".