28464621 has 4 divisors (see below), whose sum is σ = 37952832. Its totient is φ = 18976412.

The previous prime is 28464617. The next prime is 28464629. The reversal of 28464621 is 12646482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28464621 - 2² = 28464617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28464629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4744101 + ... + 4744106.

It is an arithmetic number, because the mean of its divisors is an integer number (9488208).

Almost surely, 2^28464621 is an apocalyptic number.

It is an amenable number.

28464621 is a deficient number, since it is larger than the sum of its proper divisors (9488211).

28464621 is an equidigital number, since it uses as much as digits as its factorization.

28464621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9488210.

The product of its digits is 18432, while the sum is 33.

The square root of 28464621 is about 5335.2245501010. The cubic root of 28464621 is about 305.3292905090.

The spelling of 28464621 in words is "twenty-eight million, four hundred sixty-four thousand, six hundred twenty-one".