28620321 has 8 divisors (see below), whose sum is σ = 38972544. Its totient is φ = 18674160.

The previous prime is 28620311. The next prime is 28620343. The reversal of 28620321 is 12302682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28620321 - 2¹⁸ = 28358177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28620291 and 28620300.

It is not an unprimeable number, because it can be changed into a prime (28620311) 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, 101350 + ... + 101631.

It is an arithmetic number, because the mean of its divisors is an integer number (4871568).

Almost surely, 2^28620321 is an apocalyptic number.

It is an amenable number.

28620321 is a deficient number, since it is larger than the sum of its proper divisors (10352223).

28620321 is a wasteful number, since it uses less digits than its factorization.

28620321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203031.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28620321 is about 5349.7963512642. The cubic root of 28620321 is about 305.8849903133.

The spelling of 28620321 in words is "twenty-eight million, six hundred twenty thousand, three hundred twenty-one".