28029420 has 36 divisors (see below), whose sum is σ = 85023120. Its totient is φ = 7474464.

The previous prime is 28029409. The next prime is 28029473. The reversal of 28029420 is 2492082.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77680 + ... + 78039.

Almost surely, 2^28029420 is an apocalyptic number.

28029420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28029420 is an abundant number, since it is smaller than the sum of its proper divisors (56993700).

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

28029420 is a wasteful number, since it uses less digits than its factorization.

28029420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155734 (or 155729 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28029420 is about 5294.2818209838. The cubic root of 28029420 is about 303.7652128742.

The spelling of 28029420 in words is "twenty-eight million, twenty-nine thousand, four hundred twenty".