28620420 has 48 divisors (see below), whose sum is σ = 80525760. Its totient is φ = 7595136.

The previous prime is 28620391. The next prime is 28620421. The reversal of 28620420 is 2402682.

It is not an unprimeable number, because it can be changed into a prime (28620421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12699 + ... + 14781.

It is an arithmetic number, because the mean of its divisors is an integer number (1677620).

Almost surely, 2^28620420 is an apocalyptic number.

28620420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28620420 is an abundant number, since it is smaller than the sum of its proper divisors (51905340).

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

28620420 is a wasteful number, since it uses less digits than its factorization.

28620420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2324 (or 2322 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 28620420 is about 5349.8056039449. The cubic root of 28620420 is about 305.8853430065.

It can be divided in two parts, 286 and 20420, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 28620420 in words is "twenty-eight million, six hundred twenty thousand, four hundred twenty".