28156061 has 2 divisors, whose sum is σ = 28156062. Its totient is φ = 28156060.

The previous prime is 28156057. The next prime is 28156067. The reversal of 28156061 is 16065182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27772900 + 383161 = 5270^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 28156061 - 2² = 28156057 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28156067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14078030 + 14078031.

It is an arithmetic number, because the mean of its divisors is an integer number (14078031).

Almost surely, 2^28156061 is an apocalyptic number.

It is an amenable number.

28156061 is a deficient number, since it is larger than the sum of its proper divisors (1).

28156061 is an equidigital number, since it uses as much as digits as its factorization.

28156061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28156061 is about 5306.2285099683. The cubic root of 28156061 is about 304.2220107546. Note that the first 3 decimals are identical.

The spelling of 28156061 in words is "twenty-eight million, one hundred fifty-six thousand, sixty-one".