28621851 has 4 divisors (see below), whose sum is σ = 38162472. Its totient is φ = 19081232.

The previous prime is 28621849. The next prime is 28621861. The reversal of 28621851 is 15812682.

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

It is a cyclic number.

It is not a de Polignac number, because 28621851 - 2¹ = 28621849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28621841) 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, 4770306 + ... + 4770311.

It is an arithmetic number, because the mean of its divisors is an integer number (9540618).

Almost surely, 2^28621851 is an apocalyptic number.

28621851 is a deficient number, since it is larger than the sum of its proper divisors (9540621).

28621851 is an equidigital number, since it uses as much as digits as its factorization.

28621851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9540620.

The product of its digits is 7680, while the sum is 33.

The square root of 28621851 is about 5349.9393454506. The cubic root of 28621851 is about 305.8904409358.

The spelling of 28621851 in words is "twenty-eight million, six hundred twenty-one thousand, eight hundred fifty-one".