28628004 has 48 divisors (see below), whose sum is σ = 70672896. Its totient is φ = 9004800.

The previous prime is 28627979. The next prime is 28628009. The reversal of 28628004 is 40082682.

It is a happy number.

It is a super-2 number, since 2×28628004² = 1639125226048032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28628009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14314 + ... + 16190.

It is an arithmetic number, because the mean of its divisors is an integer number (1472352).

Almost surely, 2^28628004 is an apocalyptic number.

It is an amenable number.

28628004 is an abundant number, since it is smaller than the sum of its proper divisors (42044892).

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

28628004 is a wasteful number, since it uses less digits than its factorization.

28628004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956 (or 1954 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28628004 is about 5350.5143677968. The cubic root of 28628004 is about 305.9123590270.

The spelling of 28628004 in words is "twenty-eight million, six hundred twenty-eight thousand, four".