28373989 has 8 divisors (see below), whose sum is σ = 33089600. Its totient is φ = 24320268.

The previous prime is 28373963. The next prime is 28373993. The reversal of 28373989 is 98937382.

It is not a de Polignac number, because 28373989 - 2²¹ = 26276837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28373909) 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, 41019 + ... + 41704.

It is an arithmetic number, because the mean of its divisors is an integer number (4136200).

Almost surely, 2^28373989 is an apocalyptic number.

It is an amenable number.

28373989 is a deficient number, since it is larger than the sum of its proper divisors (4715611).

28373989 is an frugal number, since it uses more digits than its factorization.

28373989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82744 (or 82730 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 28373989 is about 5326.7240401583. The cubic root of 28373989 is about 305.0048874967.

The spelling of 28373989 in words is "twenty-eight million, three hundred seventy-three thousand, nine hundred eighty-nine".