28677620 has 24 divisors (see below), whose sum is σ = 60613224. Its totient is φ = 11396736.

The previous prime is 28677601. The next prime is 28677653. The reversal of 28677620 is 2677682.

It can be written as a sum of positive squares in 4 ways, for example, as 3857296 + 24820324 = 1964^2 + 4982^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1427 + ... + 7706.

It is an arithmetic number, because the mean of its divisors is an integer number (2525551).

Almost surely, 2^28677620 is an apocalyptic number.

28677620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28677620 is an abundant number, since it is smaller than the sum of its proper divisors (31935604).

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

28677620 is a wasteful number, since it uses less digits than its factorization.

28677620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9299 (or 9297 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 28677620 is about 5355.1489241663. The cubic root of 28677620 is about 306.0889854692.

The spelling of 28677620 in words is "twenty-eight million, six hundred seventy-seven thousand, six hundred twenty".