28908401 has 4 divisors (see below), whose sum is σ = 30165312. Its totient is φ = 27651492.

The previous prime is 28908343. The next prime is 28908409. The reversal of 28908401 is 10480982.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10480982 = 2 ⋅5240491.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28908401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28908409) 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, 628421 + ... + 628466.

It is an arithmetic number, because the mean of its divisors is an integer number (7541328).

Almost surely, 2^28908401 is an apocalyptic number.

It is an amenable number.

28908401 is a deficient number, since it is larger than the sum of its proper divisors (1256911).

28908401 is a wasteful number, since it uses less digits than its factorization.

28908401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256910.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28908401 is about 5376.6533271172. The cubic root of 28908401 is about 306.9078688127.

The spelling of 28908401 in words is "twenty-eight million, nine hundred eight thousand, four hundred one".