8372128405 has 8 divisors (see below), whose sum is σ = 10048743000. Its totient is φ = 6696243456.

The previous prime is 8372128399. The next prime is 8372128439. The reversal of 8372128405 is 5048212738.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6019587396 + 2352541009 = 77586^2 + 48503^2 .

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 8372128405 - 2⁷ = 8372128277 is a prime.

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, 156840 + ... + 203329.

It is an arithmetic number, because the mean of its divisors is an integer number (1256092875).

Almost surely, 2^8372128405 is an apocalyptic number.

It is an amenable number.

8372128405 is a deficient number, since it is larger than the sum of its proper divisors (1676614595).

8372128405 is a wasteful number, since it uses less digits than its factorization.

8372128405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364823.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 8372128405 is about 91499.3355440355. The cubic root of 8372128405 is about 2030.5419217755.

The spelling of 8372128405 in words is "eight billion, three hundred seventy-two million, one hundred twenty-eight thousand, four hundred five".