28491449 has 8 divisors (see below), whose sum is σ = 33612288. Its totient is φ = 23633280.

The previous prime is 28491409. The next prime is 28491521. The reversal of 28491449 is 94419482.

28491449 = 7² + 8² + ... + 440².

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 28491449 - 2⁸ = 28491193 is a prime.

It is a super-2 number, since 2×28491449² = 1623525332239202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28491409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65432 + ... + 65865.

It is an arithmetic number, because the mean of its divisors is an integer number (4201536).

Almost surely, 2^28491449 is an apocalyptic number.

It is an amenable number.

28491449 is a deficient number, since it is larger than the sum of its proper divisors (5120839).

28491449 is a wasteful number, since it uses less digits than its factorization.

28491449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131335.

The product of its digits is 82944, while the sum is 41.

The square root of 28491449 is about 5337.7381914065. The cubic root of 28491449 is about 305.4251850124.

The spelling of 28491449 in words is "twenty-eight million, four hundred ninety-one thousand, four hundred forty-nine".