28922401 has 8 divisors (see below), whose sum is σ = 29231144. Its totient is φ = 28615680.

The previous prime is 28922371. The next prime is 28922407. The reversal of 28922401 is 10422982.

It can be written as a sum of positive squares in 4 ways, for example, as 21025 + 28901376 = 145^2 + 5376^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28922401 - 2¹⁹ = 28398113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28922401.

It is not an unprimeable number, because it can be changed into a prime (28922407) 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 7 ways as a sum of consecutive naturals, for example, 53191 + ... + 53731.

It is an arithmetic number, because the mean of its divisors is an integer number (3653893).

Almost surely, 2^28922401 is an apocalyptic number.

It is an amenable number.

28922401 is a deficient number, since it is larger than the sum of its proper divisors (308743).

28922401 is a wasteful number, since it uses less digits than its factorization.

28922401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28922401 is about 5377.9550946433. The cubic root of 28922401 is about 306.9574047790.

The spelling of 28922401 in words is "twenty-eight million, nine hundred twenty-two thousand, four hundred one".