28426840 has 32 divisors (see below), whose sum is σ = 68881680. Its totient is φ = 10495872.

The previous prime is 28426837. The next prime is 28426843. The reversal of 28426840 is 4862482.

It is an interprime number because it is at equal distance from previous prime (28426837) and next prime (28426843).

It is a junction number, because it is equal to n+sod(n) for n = 28426796 and 28426805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28426843) 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 in 7 ways as a sum of consecutive naturals, for example, 26814 + ... + 27853.

Almost surely, 2^28426840 is an apocalyptic number.

28426840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28426840 is an abundant number, since it is smaller than the sum of its proper divisors (40454840).

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

28426840 is a wasteful number, since it uses less digits than its factorization.

28426840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54691 (or 54687 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 28426840 is about 5331.6826612243. The cubic root of 28426840 is about 305.1941431690.

It can be divided in two parts, 284 and 26840, that multiplied together give a triangular number (7622560 = T₃₉₀₄).

The spelling of 28426840 in words is "twenty-eight million, four hundred twenty-six thousand, eight hundred forty".