28081156 has 6 divisors (see below), whose sum is σ = 49142030. Its totient is φ = 14040576.

The previous prime is 28081153. The next prime is 28081159. The reversal of 28081156 is 65118082.

It is an interprime number because it is at equal distance from previous prime (28081153) and next prime (28081159).

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 7650756 = 4520^2 + 2766^2 .

It is a super-3 number, since 3×28081156³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28081153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3510141 + ... + 3510148.

Almost surely, 2^28081156 is an apocalyptic number.

It is an amenable number.

28081156 is a deficient number, since it is larger than the sum of its proper divisors (21060874).

28081156 is a wasteful number, since it uses less digits than its factorization.

28081156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7020293 (or 7020291 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 28081156 is about 5299.1655946951. The cubic root of 28081156 is about 303.9519920727.

The spelling of 28081156 in words is "twenty-eight million, eighty-one thousand, one hundred fifty-six".