28948039 has 4 divisors (see below), whose sum is σ = 30471640. Its totient is φ = 27424440.

The previous prime is 28948037. The next prime is 28948043. The reversal of 28948039 is 93084982.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28948039 - 2¹ = 28948037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28947986 and 28948004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28948037) 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, 761772 + ... + 761809.

It is an arithmetic number, because the mean of its divisors is an integer number (7617910).

Almost surely, 2^28948039 is an apocalyptic number.

28948039 is a deficient number, since it is larger than the sum of its proper divisors (1523601).

28948039 is a wasteful number, since it uses less digits than its factorization.

28948039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523600.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 28948039 is about 5380.3381863968. The cubic root of 28948039 is about 307.0480778612.

The spelling of 28948039 in words is "twenty-eight million, nine hundred forty-eight thousand, thirty-nine".