28540426 has 8 divisors (see below), whose sum is σ = 42833700. Its totient is φ = 14262528.

The previous prime is 28540417. The next prime is 28540427. The reversal of 28540426 is 62404582.

It can be written as a sum of positive squares in 2 ways, for example, as 22043025 + 6497401 = 4695^2 + 2549^2 .

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

It is a super-2 number, since 2×28540426² = 1629111832522952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28540427) 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, 4000 + ... + 8548.

Almost surely, 2^28540426 is an apocalyptic number.

28540426 is a deficient number, since it is larger than the sum of its proper divisors (14293274).

28540426 is a wasteful number, since it uses less digits than its factorization.

28540426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7688.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 28540426 is about 5342.3240261145. The cubic root of 28540426 is about 305.6000941700.

The spelling of 28540426 in words is "twenty-eight million, five hundred forty thousand, four hundred twenty-six".