28921006 has 4 divisors (see below), whose sum is σ = 43381512. Its totient is φ = 14460502.

The previous prime is 28920989. The next prime is 28921007. The reversal of 28921006 is 60012982.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7230250 + ... + 7230253.

It is an arithmetic number, because the mean of its divisors is an integer number (10845378).

Almost surely, 2^28921006 is an apocalyptic number.

28921006 is a deficient number, since it is larger than the sum of its proper divisors (14460506).

28921006 is a wasteful number, since it uses less digits than its factorization.

28921006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14460505.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28921006 is about 5377.8253969425. The cubic root of 28921006 is about 306.9524695910.

Adding to 28921006 its reverse (60012982), we get a palindrome (88933988).

The spelling of 28921006 in words is "twenty-eight million, nine hundred twenty-one thousand, six".