28340426 has 4 divisors (see below), whose sum is σ = 42510642. Its totient is φ = 14170212.

The previous prime is 28340423. The next prime is 28340467. The reversal of 28340426 is 62404382.

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

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 8404201 = 4465^2 + 2899^2 .

It is a super-2 number, since 2×28340426² = 1606359491722952, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28340423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7085105 + ... + 7085108.

Almost surely, 2^28340426 is an apocalyptic number.

28340426 is a deficient number, since it is larger than the sum of its proper divisors (14170216).

28340426 is a wasteful number, since it uses less digits than its factorization.

28340426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14170215.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 28340426 is about 5323.5726725574. The cubic root of 28340426 is about 304.8845787399.

The spelling of 28340426 in words is "twenty-eight million, three hundred forty thousand, four hundred twenty-six".