28903997 has 12 divisors (see below), whose sum is σ = 31458240. Its totient is φ = 26482680.

The previous prime is 28903991. The next prime is 28904009. The reversal of 28903997 is 79930982.

It is not a de Polignac number, because 28903997 - 2⁶ = 28903933 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 (28903991) 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 11 ways as a sum of consecutive naturals, for example, 17468 + ... + 19050.

It is an arithmetic number, because the mean of its divisors is an integer number (2621520).

Almost surely, 2^28903997 is an apocalyptic number.

It is an amenable number.

28903997 is a deficient number, since it is larger than the sum of its proper divisors (2554243).

28903997 is a wasteful number, since it uses less digits than its factorization.

28903997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 28903997 is about 5376.2437630747. The cubic root of 28903997 is about 306.8922829063.

The spelling of 28903997 in words is "twenty-eight million, nine hundred three thousand, nine hundred ninety-seven".