28156029556 has 6 divisors (see below), whose sum is σ = 49273051730. Its totient is φ = 14078014776.

The previous prime is 28156029521. The next prime is 28156029593. The reversal of 28156029556 is 65592065182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16195107600 + 11960921956 = 127260^2 + 109366^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3519503691 + ... + 3519503698.

Almost surely, 2^28156029556 is an apocalyptic number.

It is an amenable number.

28156029556 is a deficient number, since it is larger than the sum of its proper divisors (21117022174).

28156029556 is a wasteful number, since it uses less digits than its factorization.

28156029556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7039007393 (or 7039007391 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 28156029556 in words is "twenty-eight billion, one hundred fifty-six million, twenty-nine thousand, five hundred fifty-six".