28429261 has 12 divisors (see below), whose sum is σ = 33158268. Its totient is φ = 24303552.

The previous prime is 28429249. The next prime is 28429273. The reversal of 28429261 is 16292482.

It is an interprime number because it is at equal distance from previous prime (28429249) and next prime (28429273).

It can be written as a sum of positive squares in 2 ways, for example, as 27562500 + 866761 = 5250^2 + 931^2 .

It is not a de Polignac number, because 28429261 - 2⁵ = 28429229 is a prime.

It is a super-2 number, since 2×28429261² = 1616445762012242, 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 (28429861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32745 + ... + 33601.

It is an arithmetic number, because the mean of its divisors is an integer number (2763189).

Almost surely, 2^28429261 is an apocalyptic number.

It is an amenable number.

28429261 is a deficient number, since it is larger than the sum of its proper divisors (4729007).

28429261 is an equidigital number, since it uses as much as digits as its factorization.

28429261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1541 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 28429261 is about 5331.9096954093. The cubic root of 28429261 is about 305.2028069770.

The spelling of 28429261 in words is "twenty-eight million, four hundred twenty-nine thousand, two hundred sixty-one".