28648407 has 4 divisors (see below), whose sum is σ = 38197880. Its totient is φ = 19098936.

The previous prime is 28648369. The next prime is 28648439. The reversal of 28648407 is 70484682.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28648407 - 2⁶ = 28648343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28648457) 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, 4774732 + ... + 4774737.

It is an arithmetic number, because the mean of its divisors is an integer number (9549470).

Almost surely, 2^28648407 is an apocalyptic number.

28648407 is a deficient number, since it is larger than the sum of its proper divisors (9549473).

28648407 is an equidigital number, since it uses as much as digits as its factorization.

28648407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549472.

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 28648407 is about 5352.4206673243. The cubic root of 28648407 is about 305.9850157129.

The spelling of 28648407 in words is "twenty-eight million, six hundred forty-eight thousand, four hundred seven".