28170629 has 4 divisors (see below), whose sum is σ = 29142060. Its totient is φ = 27199200.

The previous prime is 28170601. The next prime is 28170677. The reversal of 28170629 is 92607182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92607182 = 2 ⋅46303591.

It can be written as a sum of positive squares in 2 ways, for example, as 5750404 + 22420225 = 2398^2 + 4735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28170629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28170229) 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, 485672 + ... + 485729.

It is an arithmetic number, because the mean of its divisors is an integer number (7285515).

Almost surely, 2^28170629 is an apocalyptic number.

28170629 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28170629 is a deficient number, since it is larger than the sum of its proper divisors (971431).

28170629 is an equidigital number, since it uses as much as digits as its factorization.

28170629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971430.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 28170629 is about 5307.6010588589. The cubic root of 28170629 is about 304.2744700589.

The spelling of 28170629 in words is "twenty-eight million, one hundred seventy thousand, six hundred twenty-nine".