28874881 has 8 divisors (see below), whose sum is σ = 33168960. Its totient is φ = 24623088.

The previous prime is 28874869. The next prime is 28874897. The reversal of 28874881 is 18847882.

It is a happy number.

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

It is not a de Polignac number, because 28874881 - 2¹³ = 28866689 is a prime.

It is a super-2 number, since 2×28874881² = 1667517505528322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28874831) 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, 9091 + ... + 11848.

It is an arithmetic number, because the mean of its divisors is an integer number (4146120).

Almost surely, 2^28874881 is an apocalyptic number.

It is an amenable number.

28874881 is a deficient number, since it is larger than the sum of its proper divisors (4294079).

28874881 is a wasteful number, since it uses less digits than its factorization.

28874881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21143.

The product of its digits is 229376, while the sum is 46.

The square root of 28874881 is about 5373.5352422777. The cubic root of 28874881 is about 306.7892005341.

The spelling of 28874881 in words is "twenty-eight million, eight hundred seventy-four thousand, eight hundred eighty-one".