28662020 has 12 divisors (see below), whose sum is σ = 60190284. Its totient is φ = 11464800.

The previous prime is 28662019. The next prime is 28662031. The reversal of 28662020 is 2026682.

It can be written as a sum of positive squares in 2 ways, for example, as 11999296 + 16662724 = 3464^2 + 4082^2 .

It is a super-2 number, since 2×28662020² = 1643022780960800, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 716531 + ... + 716570.

It is an arithmetic number, because the mean of its divisors is an integer number (5015857).

Almost surely, 2^28662020 is an apocalyptic number.

28662020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28662020 is an abundant number, since it is smaller than the sum of its proper divisors (31528264).

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

28662020 is a wasteful number, since it uses less digits than its factorization.

28662020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433110 (or 1433108 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28662020 is about 5353.6921839045. The cubic root of 28662020 is about 306.0334734908.

The spelling of 28662020 in words is "twenty-eight million, six hundred sixty-two thousand, twenty".