28007420 has 36 divisors (see below), whose sum is σ = 68420520. Its totient is φ = 9602208.

The previous prime is 28007393. The next prime is 28007423. The reversal of 28007420 is 2470082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28007423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13310 + ... + 15269.

It is an arithmetic number, because the mean of its divisors is an integer number (1900570).

Almost surely, 2^28007420 is an apocalyptic number.

28007420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28007420 is an abundant number, since it is smaller than the sum of its proper divisors (40413100).

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

28007420 is a wasteful number, since it uses less digits than its factorization.

28007420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28602 (or 28593 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 28007420 is about 5292.2036997833. The cubic root of 28007420 is about 303.6857180211.

The spelling of 28007420 in words is "twenty-eight million, seven thousand, four hundred twenty".