7900816399 has 24 divisors (see below), whose sum is σ = 9463175568. Its totient is φ = 6573087360.

The previous prime is 7900816393. The next prime is 7900816403. The reversal of 7900816399 is 9936180097.

It is not a de Polignac number, because 7900816399 - 2¹⁹ = 7900292111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7900816393) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 385792 + ... + 405754.

It is an arithmetic number, because the mean of its divisors is an integer number (394298982).

Almost surely, 2^7900816399 is an apocalyptic number.

7900816399 is a deficient number, since it is larger than the sum of its proper divisors (1562359169).

7900816399 is a wasteful number, since it uses less digits than its factorization.

7900816399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20215 (or 20208 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 7900816399 is about 88886.5366576964. The cubic root of 7900816399 is about 1991.7003050926.

The spelling of 7900816399 in words is "seven billion, nine hundred million, eight hundred sixteen thousand, three hundred ninety-nine".