28480397 has 4 divisors (see below), whose sum is σ = 31069536. Its totient is φ = 25891260.

The previous prime is 28480391. The next prime is 28480409. The reversal of 28480397 is 79308482.

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.

It is a cyclic number.

It is not a de Polignac number, because 28480397 - 2⁴ = 28480381 is a prime.

It is a super-2 number, since 2×28480397² = 1622266026555218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28480391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294553 + ... + 1294574.

It is an arithmetic number, because the mean of its divisors is an integer number (7767384).

Almost surely, 2^28480397 is an apocalyptic number.

It is an amenable number.

28480397 is a deficient number, since it is larger than the sum of its proper divisors (2589139).

28480397 is a wasteful number, since it uses less digits than its factorization.

28480397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589138.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28480397 is about 5336.7028210310. The cubic root of 28480397 is about 305.3856878320.

The spelling of 28480397 in words is "twenty-eight million, four hundred eighty thousand, three hundred ninety-seven".