28493121 has 8 divisors (see below), whose sum is σ = 38246400. Its totient is φ = 18867632.

The previous prime is 28493117. The next prime is 28493131. The reversal of 28493121 is 12139482.

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 28493121 - 2² = 28493117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28493111) 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, 31425 + ... + 32318.

It is an arithmetic number, because the mean of its divisors is an integer number (4780800).

Almost surely, 2^28493121 is an apocalyptic number.

It is an amenable number.

28493121 is a deficient number, since it is larger than the sum of its proper divisors (9753279).

28493121 is a wasteful number, since it uses less digits than its factorization.

28493121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63895.

The product of its digits is 3456, while the sum is 30.

The square root of 28493121 is about 5337.8948097541. The cubic root of 28493121 is about 305.4311594473.

The spelling of 28493121 in words is "twenty-eight million, four hundred ninety-three thousand, one hundred twenty-one".