28402420 has 12 divisors (see below), whose sum is σ = 59645124. Its totient is φ = 11360960.

The previous prime is 28402411. The next prime is 28402433. The reversal of 28402420 is 2420482.

It can be written as a sum of positive squares in 2 ways, for example, as 21123216 + 7279204 = 4596^2 + 2698^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28402391 and 28402400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710041 + ... + 710080.

It is an arithmetic number, because the mean of its divisors is an integer number (4970427).

Almost surely, 2^28402420 is an apocalyptic number.

28402420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28402420 is an abundant number, since it is smaller than the sum of its proper divisors (31242704).

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

28402420 is a wasteful number, since it uses less digits than its factorization.

28402420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420130 (or 1420128 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 28402420 is about 5329.3920854071. The cubic root of 28402420 is about 305.1067260647.

The spelling of 28402420 in words is "twenty-eight million, four hundred two thousand, four hundred twenty".