28904567 has 4 divisors (see below), whose sum is σ = 30425880. Its totient is φ = 27383256.

The previous prime is 28904563. The next prime is 28904587. The reversal of 28904567 is 76540982.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28904567 - 2² = 28904563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760628 + ... + 760665.

It is an arithmetic number, because the mean of its divisors is an integer number (7606470).

Almost surely, 2^28904567 is an apocalyptic number.

28904567 is a deficient number, since it is larger than the sum of its proper divisors (1521313).

28904567 is a wasteful number, since it uses less digits than its factorization.

28904567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521312.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 28904567 is about 5376.2967738026. The cubic root of 28904567 is about 306.8943002450.

The spelling of 28904567 in words is "twenty-eight million, nine hundred four thousand, five hundred sixty-seven".