28428638 has 8 divisors (see below), whose sum is σ = 48734832. Its totient is φ = 12183696.

The previous prime is 28428637. The next prime is 28428649. The reversal of 28428638 is 83682482.

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

It is a junction number, because it is equal to n+sod(n) for n = 28428595 and 28428604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28428637) 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, 1015295 + ... + 1015322.

It is an arithmetic number, because the mean of its divisors is an integer number (6091854).

Almost surely, 2^28428638 is an apocalyptic number.

28428638 is a deficient number, since it is larger than the sum of its proper divisors (20306194).

28428638 is a wasteful number, since it uses less digits than its factorization.

28428638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030626.

The product of its digits is 147456, while the sum is 41.

The square root of 28428638 is about 5331.8512732446. The cubic root of 28428638 is about 305.2005775517.

The spelling of 28428638 in words is "twenty-eight million, four hundred twenty-eight thousand, six hundred thirty-eight".