28375081 has 8 divisors (see below), whose sum is σ = 32636480. Its totient is φ = 24165648.

The previous prime is 28375073. The next prime is 28375093. The reversal of 28375081 is 18057382.

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

It is a cyclic number.

It is not a de Polignac number, because 28375081 - 2³ = 28375073 is a prime.

It is a super-2 number, since 2×28375081² = 1610290443513122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28375051) 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, 11811 + ... + 14008.

It is an arithmetic number, because the mean of its divisors is an integer number (4079560).

Almost surely, 2^28375081 is an apocalyptic number.

It is an amenable number.

28375081 is a deficient number, since it is larger than the sum of its proper divisors (4261399).

28375081 is a wasteful number, since it uses less digits than its factorization.

28375081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25983.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28375081 is about 5326.8265411969. The cubic root of 28375081 is about 305.0088002477.

The spelling of 28375081 in words is "twenty-eight million, three hundred seventy-five thousand, eighty-one".