28180669 has 8 divisors (see below), whose sum is σ = 31202208. Its totient is φ = 25235760.

The previous prime is 28180661. The next prime is 28180673. The reversal of 28180669 is 96608182.

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

It is not a de Polignac number, because 28180669 - 2³ = 28180661 is a prime.

It is a super-2 number, since 2×28180669² = 1588300210575122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28180661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18382 + ... + 19855.

It is an arithmetic number, because the mean of its divisors is an integer number (3900276).

Almost surely, 2^28180669 is an apocalyptic number.

It is an amenable number.

28180669 is a deficient number, since it is larger than the sum of its proper divisors (3021539).

28180669 is a wasteful number, since it uses less digits than its factorization.

28180669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38315.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28180669 is about 5308.5467879637. The cubic root of 28180669 is about 304.3106135286.

The spelling of 28180669 in words is "twenty-eight million, one hundred eighty thousand, six hundred sixty-nine".