28629145 has 4 divisors (see below), whose sum is σ = 34354980. Its totient is φ = 22903312.

The previous prime is 28629131. The next prime is 28629149. The reversal of 28629145 is 54192682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4393216 + 24235929 = 2096^2 + 4923^2 .

It is a cyclic number.

It is not a de Polignac number, because 28629145 - 2⁷ = 28629017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28629149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862910 + ... + 2862919.

It is an arithmetic number, because the mean of its divisors is an integer number (8588745).

Almost surely, 2^28629145 is an apocalyptic number.

It is an amenable number.

28629145 is a deficient number, since it is larger than the sum of its proper divisors (5725835).

28629145 is an equidigital number, since it uses as much as digits as its factorization.

28629145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5725834.

The product of its digits is 34560, while the sum is 37.

The square root of 28629145 is about 5350.6209919971. The cubic root of 28629145 is about 305.9164231288.

The spelling of 28629145 in words is "twenty-eight million, six hundred twenty-nine thousand, one hundred forty-five".