28420630 has 32 divisors (see below), whose sum is σ = 58999104. Its totient is φ = 9655296.

The previous prime is 28420619. The next prime is 28420631. The reversal of 28420630 is 3602482.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28420595 and 28420604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28420631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6114 + ... + 9706.

It is an arithmetic number, because the mean of its divisors is an integer number (1843722).

Almost surely, 2^28420630 is an apocalyptic number.

28420630 is an abundant number, since it is smaller than the sum of its proper divisors (30578474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28420630 is a wasteful number, since it uses less digits than its factorization.

28420630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 28420630 is about 5331.1002616721. The cubic root of 28420630 is about 305.1719177692.

The spelling of 28420630 in words is "twenty-eight million, four hundred twenty thousand, six hundred thirty".