7821323998 has 8 divisors (see below), whose sum is σ = 11732461992. Its totient is φ = 3910503336.

The previous prime is 7821323987. The next prime is 7821323999. The reversal of 7821323998 is 8993231287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7821323998² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821323999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3040 + ... + 125107.

It is an arithmetic number, because the mean of its divisors is an integer number (1466557749).

Almost surely, 2^7821323998 is an apocalyptic number.

7821323998 is a deficient number, since it is larger than the sum of its proper divisors (3911137994).

7821323998 is a wasteful number, since it uses less digits than its factorization.

7821323998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158666.

The product of its digits is 1306368, while the sum is 52.

The square root of 7821323998 is about 88438.2496321586. The cubic root of 7821323998 is about 1984.9980858097.

The spelling of 7821323998 in words is "seven billion, eight hundred twenty-one million, three hundred twenty-three thousand, nine hundred ninety-eight".