28709906004 has 240 divisors, whose sum is σ = 82181062656. Its totient is φ = 8687347200.

The previous prime is 28709906003. The next prime is 28709906021. The reversal of 28709906004 is 40060990782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28709906003) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 102170344 + ... + 102170624.

Almost surely, 2^28709906004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28709906004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41090531328).

28709906004 is an abundant number, since it is smaller than the sum of its proper divisors (53471156652).

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

28709906004 is a wasteful number, since it uses less digits than its factorization.

28709906004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 28709906004 in words is "twenty-eight billion, seven hundred nine million, nine hundred six thousand, four".