28391576004 has 405 divisors, whose sum is σ = 87650476221. Its totient is φ = 8007024960.

The previous prime is 28391575999. The next prime is 28391576011. The reversal of 28391576004 is 40067519382.

The square root of 28391576004 is 168498.

It is a perfect power (a square), and thus also a powerful number.

28391576004 is a `hidden beast` number, since 2 + 8 + 39 + 1 + 5 + 7 + 600 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25405172100 + 2986403904 = 159390^2 + 54648^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 767339874 + ... + 767339910.

It is a 1-persistent number, because it is pandigital, but 2⋅28391576004 = 56783152008 is not.

Almost surely, 2^28391576004 is an apocalyptic number.

28391576004 is the 168498-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28391576004

28391576004 is an abundant number, since it is smaller than the sum of its proper divisors (59258900217).

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

28391576004 is a wasteful number, since it uses less digits than its factorization.

28391576004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 28391576004 in words is "twenty-eight billion, three hundred ninety-one million, five hundred seventy-six thousand, four".