28801356 has 48 divisors (see below), whose sum is σ = 69995520. Its totient is φ = 9207360.

The previous prime is 28801351. The next prime is 28801361. The reversal of 28801356 is 65310882.

28801356 = T₁ + T₂ + ... + T₅₅₆.

It is a happy number.

28801356 is a nontrivial binomial coefficient, being equal to C(558, 3).

It is an interprime number because it is at equal distance from previous prime (28801351) and next prime (28801361).

It is not an unprimeable number, because it can be changed into a prime (28801351) by changing a digit.

It is the 556-th tetrahedral number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51430 + ... + 51986.

It is an arithmetic number, because the mean of its divisors is an integer number (1458240).

Almost surely, 2^28801356 is an apocalyptic number.

It is an amenable number.

28801356 is an abundant number, since it is smaller than the sum of its proper divisors (41194164).

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

28801356 is a wasteful number, since it uses less digits than its factorization.

28801356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 732 counting only the distinct ones).

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

The square root of 28801356 is about 5366.6894823532. The cubic root of 28801356 is about 306.5285836022.

The spelling of 28801356 in words is "twenty-eight million, eight hundred one thousand, three hundred fifty-six".