28528629 has 4 divisors (see below), whose sum is σ = 38038176. Its totient is φ = 19019084.

The previous prime is 28528609. The next prime is 28528639. The reversal of 28528629 is 92682582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28528629 - 2⁷ = 28528501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4754769 + ... + 4754774.

It is an arithmetic number, because the mean of its divisors is an integer number (9509544).

Almost surely, 2^28528629 is an apocalyptic number.

It is an amenable number.

28528629 is a deficient number, since it is larger than the sum of its proper divisors (9509547).

28528629 is an equidigital number, since it uses as much as digits as its factorization.

28528629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9509546.

The product of its digits is 138240, while the sum is 42.

The square root of 28528629 is about 5341.2198045016. The cubic root of 28528629 is about 305.5579824282.

The spelling of 28528629 in words is "twenty-eight million, five hundred twenty-eight thousand, six hundred twenty-nine".