28691355 has 32 divisors (see below), whose sum is σ = 57235968. Its totient is φ = 11923200.

The previous prime is 28691347. The next prime is 28691381. The reversal of 28691355 is 55319682.

It is not a de Polignac number, because 28691355 - 2³ = 28691347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11266 + ... + 13575.

It is an arithmetic number, because the mean of its divisors is an integer number (1788624).

Almost surely, 2^28691355 is an apocalyptic number.

28691355 is a deficient number, since it is larger than the sum of its proper divisors (28544613).

28691355 is a wasteful number, since it uses less digits than its factorization.

28691355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24867.

The product of its digits is 64800, while the sum is 39.

The square root of 28691355 is about 5356.4311812997. The cubic root of 28691355 is about 306.1378442566.

It can be divided in two parts, 2869 and 1355, that added together give a palindrome (4224).

The spelling of 28691355 in words is "twenty-eight million, six hundred ninety-one thousand, three hundred fifty-five".