28471277 has 8 divisors (see below), whose sum is σ = 30196152. Its totient is φ = 26752000.

The previous prime is 28471271. The next prime is 28471279. The reversal of 28471277 is 77217482.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 391876 + 28079401 = 626^2 + 5299^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28471277 is a prime.

It is a super-2 number, since 2×28471277² = 1621227228021458, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28471277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28471271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14027 + ... + 15927.

It is an arithmetic number, because the mean of its divisors is an integer number (3774519).

Almost surely, 2^28471277 is an apocalyptic number.

It is an amenable number.

28471277 is a deficient number, since it is larger than the sum of its proper divisors (1724875).

28471277 is a wasteful number, since it uses less digits than its factorization.

28471277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799.

The product of its digits is 43904, while the sum is 38.

The square root of 28471277 is about 5335.8482924461. The cubic root of 28471277 is about 305.3530874576.

The spelling of 28471277 in words is "twenty-eight million, four hundred seventy-one thousand, two hundred seventy-seven".