28169351 has 4 divisors (see below), whose sum is σ = 32193552. Its totient is φ = 24145152.

The previous prime is 28169347. The next prime is 28169363. The reversal of 28169351 is 15396182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28169351 - 2² = 28169347 is a prime.

It is a super-2 number, since 2×28169351² = 1587024671522402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28169551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012090 + ... + 2012103.

It is an arithmetic number, because the mean of its divisors is an integer number (8048388).

Almost surely, 2^28169351 is an apocalyptic number.

28169351 is a deficient number, since it is larger than the sum of its proper divisors (4024201).

28169351 is an equidigital number, since it uses as much as digits as its factorization.

28169351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024200.

The product of its digits is 12960, while the sum is 35.

The square root of 28169351 is about 5307.4806641193. The cubic root of 28169351 is about 304.2698687103.

It can be divided in two parts, 2816 and 9351, that added together give a cube (12167 = 23³).

The spelling of 28169351 in words is "twenty-eight million, one hundred sixty-nine thousand, three hundred fifty-one".