28691356 has 6 divisors (see below), whose sum is σ = 50209880. Its totient is φ = 14345676.

The previous prime is 28691347. The next prime is 28691381. The reversal of 28691356 is 65319682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3586416 + ... + 3586423.

Almost surely, 2^28691356 is an apocalyptic number.

It is an amenable number.

28691356 is a deficient number, since it is larger than the sum of its proper divisors (21518524).

28691356 is a wasteful number, since it uses less digits than its factorization.

28691356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7172843 (or 7172841 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 28691356 is about 5356.4312746455. The cubic root of 28691356 is about 306.1378478133.

It can be divided in two parts, 2869 and 1356, that added together give a square (4225 = 65²).

The spelling of 28691356 in words is "twenty-eight million, six hundred ninety-one thousand, three hundred fifty-six".