28951389 has 12 divisors (see below), whose sum is σ = 42709056. Its totient is φ = 18889992.

The previous prime is 28951361. The next prime is 28951397. The reversal of 28951389 is 98315982.

It is a happy number.

It is not a de Polignac number, because 28951389 - 2¹² = 28947293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28951339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33799 + ... + 34644.

It is an arithmetic number, because the mean of its divisors is an integer number (3559088).

Almost surely, 2^28951389 is an apocalyptic number.

It is an amenable number.

28951389 is a deficient number, since it is larger than the sum of its proper divisors (13757667).

28951389 is a wasteful number, since it uses less digits than its factorization.

28951389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68496 (or 68493 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 28951389 is about 5380.6494961110. The cubic root of 28951389 is about 307.0599217422.

The spelling of 28951389 in words is "twenty-eight million, nine hundred fifty-one thousand, three hundred eighty-nine".