28290629 has 4 divisors (see below), whose sum is σ = 28506720. Its totient is φ = 28074540.

The previous prime is 28290599. The next prime is 28290643. The reversal of 28290629 is 92609282.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92609282 = 2 ⋅46304641.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28290629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28290592 and 28290601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290649) 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, 107849 + ... + 108110.

It is an arithmetic number, because the mean of its divisors is an integer number (7126680).

Almost surely, 2^28290629 is an apocalyptic number.

It is an amenable number.

28290629 is a deficient number, since it is larger than the sum of its proper divisors (216091).

28290629 is a wasteful number, since it uses less digits than its factorization.

28290629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216090.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 28290629 is about 5318.8935879561. The cubic root of 28290629 is about 304.7059030164.

The spelling of 28290629 in words is "twenty-eight million, two hundred ninety thousand, six hundred twenty-nine".