28438426 has 4 divisors (see below), whose sum is σ = 42657642. Its totient is φ = 14219212.

The previous prime is 28438409. The next prime is 28438429. The reversal of 28438426 is 62483482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62483482 = 2 ⋅31241741.

It can be written as a sum of positive squares in only one way, i.e., 23532201 + 4906225 = 4851^2 + 2215^2 .

It is not an unprimeable number, because it can be changed into a prime (28438429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7109605 + ... + 7109608.

Almost surely, 2^28438426 is an apocalyptic number.

28438426 is a deficient number, since it is larger than the sum of its proper divisors (14219216).

28438426 is a wasteful number, since it uses less digits than its factorization.

28438426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14219215.

The product of its digits is 73728, while the sum is 37.

The square root of 28438426 is about 5332.7690743178. The cubic root of 28438426 is about 305.2356004568.

The spelling of 28438426 in words is "twenty-eight million, four hundred thirty-eight thousand, four hundred twenty-six".