28551956 has 6 divisors (see below), whose sum is σ = 49965930. Its totient is φ = 14275976.

The previous prime is 28551953. The next prime is 28551973. The reversal of 28551956 is 65915582.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 10995856 = 4190^2 + 3316^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28551953) 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, 3568991 + ... + 3568998.

It is an arithmetic number, because the mean of its divisors is an integer number (8327655).

Almost surely, 2^28551956 is an apocalyptic number.

It is an amenable number.

28551956 is a deficient number, since it is larger than the sum of its proper divisors (21413974).

28551956 is a wasteful number, since it uses less digits than its factorization.

28551956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137993 (or 7137991 counting only the distinct ones).

The product of its digits is 108000, while the sum is 41.

The square root of 28551956 is about 5343.4030355196. The cubic root of 28551956 is about 305.6412415901.

The spelling of 28551956 in words is "twenty-eight million, five hundred fifty-one thousand, nine hundred fifty-six".