8320217405 has 8 divisors (see below), whose sum is σ = 10006111032. Its totient is φ = 6641607168.

The previous prime is 8320217393. The next prime is 8320217443. The reversal of 8320217405 is 5047120238.

It can be written as a sum of positive squares in 4 ways, for example, as 620856889 + 7699360516 = 24917^2 + 87746^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8320217405 - 2⁶ = 8320217341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1818332 + ... + 1822901.

It is an arithmetic number, because the mean of its divisors is an integer number (1250763879).

Almost surely, 2^8320217405 is an apocalyptic number.

It is an amenable number.

8320217405 is a deficient number, since it is larger than the sum of its proper divisors (1685893627).

8320217405 is a wasteful number, since it uses less digits than its factorization.

8320217405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641695.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 8320217405 is about 91215.2257301378. The cubic root of 8320217405 is about 2026.3364569995.

The spelling of 8320217405 in words is "eight billion, three hundred twenty million, two hundred seventeen thousand, four hundred five".