28461680 has 40 divisors (see below), whose sum is σ = 71266272. Its totient is φ = 10508544.

The previous prime is 28461637. The next prime is 28461691. The reversal of 28461680 is 8616482.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 28461680.

It is a congruent number.

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, 12644 + ... + 14723.

Almost surely, 2^28461680 is an apocalyptic number.

28461680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28461680 is an abundant number, since it is smaller than the sum of its proper divisors (42804592).

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

28461680 is a wasteful number, since it uses less digits than its factorization.

28461680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27393 (or 27387 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28461680 is about 5334.9489219673. The cubic root of 28461680 is about 305.3187744796.

The spelling of 28461680 in words is "twenty-eight million, four hundred sixty-one thousand, six hundred eighty".