28667620 has 24 divisors (see below), whose sum is σ = 60428088. Its totient is φ = 11424000.

The previous prime is 28667609. The next prime is 28667623. The reversal of 28667620 is 2676682.

It can be written as a sum of positive squares in 4 ways, for example, as 23716 + 28643904 = 154^2 + 5352^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28667620.

It is not an unprimeable number, because it can be changed into a prime (28667623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3070 + ... + 8170.

It is an arithmetic number, because the mean of its divisors is an integer number (2517837).

Almost surely, 2^28667620 is an apocalyptic number.

28667620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28667620 is an abundant number, since it is smaller than the sum of its proper divisors (31760468).

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

28667620 is a wasteful number, since it uses less digits than its factorization.

28667620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5391 (or 5389 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28667620 is about 5354.2151619075. The cubic root of 28667620 is about 306.0534031847.

The spelling of 28667620 in words is "twenty-eight million, six hundred sixty-seven thousand, six hundred twenty".