28165380 has 48 divisors (see below), whose sum is σ = 81587520. Its totient is φ = 7251328.

The previous prime is 28165373. The next prime is 28165381. The reversal of 28165380 is 8356182.

28165380 = T₄₆₇ + T₄₆₈ + ... + T₆₄₆.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28165381) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6354 + ... + 9833.

It is an arithmetic number, because the mean of its divisors is an integer number (1699740).

Almost surely, 2^28165380 is an apocalyptic number.

28165380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28165380 is an abundant number, since it is smaller than the sum of its proper divisors (53422140).

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

28165380 is a wasteful number, since it uses less digits than its factorization.

28165380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16228 (or 16226 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28165380 is about 5307.1065563073. The cubic root of 28165380 is about 304.2555705176.

The spelling of 28165380 in words is "twenty-eight million, one hundred sixty-five thousand, three hundred eighty".