28901129 has 4 divisors (see below), whose sum is σ = 29374980. Its totient is φ = 28427280.

The previous prime is 28901113. The next prime is 28901141. The reversal of 28901129 is 92110982.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9935104 + 18966025 = 3152^2 + 4355^2 .

It is a cyclic number.

It is not a de Polignac number, because 28901129 - 2⁴ = 28901113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28901095 and 28901104.

It is not an unprimeable number, because it can be changed into a prime (28901149) 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, 236834 + ... + 236955.

It is an arithmetic number, because the mean of its divisors is an integer number (7343745).

Almost surely, 2^28901129 is an apocalyptic number.

It is an amenable number.

28901129 is a deficient number, since it is larger than the sum of its proper divisors (473851).

28901129 is an equidigital number, since it uses as much as digits as its factorization.

28901129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473850.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 28901129 is about 5375.9770274807. The cubic root of 28901129 is about 306.8821321051.

The spelling of 28901129 in words is "twenty-eight million, nine hundred one thousand, one hundred twenty-nine".