28180646 has 8 divisors (see below), whose sum is σ = 45522624. Its totient is φ = 13006440.

The previous prime is 28180631. The next prime is 28180657. The reversal of 28180646 is 64608182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541910 + ... + 541961.

It is an arithmetic number, because the mean of its divisors is an integer number (5690328).

Almost surely, 2^28180646 is an apocalyptic number.

28180646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28180646 is a deficient number, since it is larger than the sum of its proper divisors (17341978).

28180646 is a wasteful number, since it uses less digits than its factorization.

28180646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083886.

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

The square root of 28180646 is about 5308.5446216454. The cubic root of 28180646 is about 304.3105307396.

The spelling of 28180646 in words is "twenty-eight million, one hundred eighty thousand, six hundred forty-six".