28861629 has 4 divisors (see below), whose sum is σ = 38482176. Its totient is φ = 19241084.

The previous prime is 28861607. The next prime is 28861667. The reversal of 28861629 is 92616882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28861629 - 2⁸ = 28861373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861829) 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, 4810269 + ... + 4810274.

It is an arithmetic number, because the mean of its divisors is an integer number (9620544).

Almost surely, 2^28861629 is an apocalyptic number.

It is an amenable number.

28861629 is a deficient number, since it is larger than the sum of its proper divisors (9620547).

28861629 is an equidigital number, since it uses as much as digits as its factorization.

28861629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9620546.

The product of its digits is 82944, while the sum is 42.

The square root of 28861629 is about 5372.3020205495. The cubic root of 28861629 is about 306.7422601664.

The spelling of 28861629 in words is "twenty-eight million, eight hundred sixty-one thousand, six hundred twenty-nine".