28341640 has 32 divisors (see below), whose sum is σ = 64189080. Its totient is φ = 11261952.

The previous prime is 28341623. The next prime is 28341661. The reversal of 28341640 is 4614382.

It can be written as a sum of positive squares in 4 ways, for example, as 9523396 + 18818244 = 3086^2 + 4338^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28341599 and 28341608.

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 7 ways as a sum of consecutive naturals, for example, 4024 + ... + 8536.

Almost surely, 2^28341640 is an apocalyptic number.

28341640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28341640 is an abundant number, since it is smaller than the sum of its proper divisors (35847440).

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

28341640 is a wasteful number, since it uses less digits than its factorization.

28341640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4681 (or 4677 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 28341640 is about 5323.6866925092. The cubic root of 28341640 is about 304.8889320572. Note that the first 3 decimals are identical.

The spelling of 28341640 in words is "twenty-eight million, three hundred forty-one thousand, six hundred forty".