28952621 has 4 divisors (see below), whose sum is σ = 29164092. Its totient is φ = 28741152.

The previous prime is 28952617. The next prime is 28952629. The reversal of 28952621 is 12625982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12625982 = 2 ⋅6312991.

It can be written as a sum of positive squares in 2 ways, for example, as 12460900 + 16491721 = 3530^2 + 4061^2 .

It is a cyclic number.

It is not a de Polignac number, because 28952621 - 2² = 28952617 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 (28952629) 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 3 ways as a sum of consecutive naturals, for example, 105530 + ... + 105803.

It is an arithmetic number, because the mean of its divisors is an integer number (7291023).

Almost surely, 2^28952621 is an apocalyptic number.

It is an amenable number.

28952621 is a deficient number, since it is larger than the sum of its proper divisors (211471).

28952621 is a wasteful number, since it uses less digits than its factorization.

28952621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211470.

The product of its digits is 17280, while the sum is 35.

The square root of 28952621 is about 5380.7639792134. The cubic root of 28952621 is about 307.0642772322.

The spelling of 28952621 in words is "twenty-eight million, nine hundred fifty-two thousand, six hundred twenty-one".