28051680 has 48 divisors (see below), whose sum is σ = 88364304. Its totient is φ = 7480320.

The previous prime is 28051607. The next prime is 28051691. The reversal of 28051680 is 8615082.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 28741 + ... + 29700.

It is an arithmetic number, because the mean of its divisors is an integer number (1840923).

Almost surely, 2^28051680 is an apocalyptic number.

28051680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28051680 is an abundant number, since it is smaller than the sum of its proper divisors (60312624).

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

28051680 is a wasteful number, since it uses less digits than its factorization.

28051680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58459 (or 58451 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 28051680 is about 5296.3836719029. The cubic root of 28051680 is about 303.8456048865.

The spelling of 28051680 in words is "twenty-eight million, fifty-one thousand, six hundred eighty".