28305004 has 24 divisors (see below), whose sum is σ = 60965408. Its totient is φ = 11197440.

The previous prime is 28305001. The next prime is 28305029. The reversal of 28305004 is 40050382.

28305004 = T₃₁₂ + T₃₁₃ + ... + T₅₈₄.

It is not an unprimeable number, because it can be changed into a prime (28305001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38517 + ... + 39244.

Almost surely, 2^28305004 is an apocalyptic number.

It is an amenable number.

28305004 is an abundant number, since it is smaller than the sum of its proper divisors (32660404).

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

28305004 is a wasteful number, since it uses less digits than its factorization.

28305004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77785 (or 77783 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 28305004 is about 5320.2447312130. The cubic root of 28305004 is about 304.7575032087.

Adding to 28305004 its reverse (40050382), we get a palindrome (68355386).

The spelling of 28305004 in words is "twenty-eight million, three hundred five thousand, four".