28557629 has 8 divisors (see below), whose sum is σ = 28864512. Its totient is φ = 28252720.

The previous prime is 28557553. The next prime is 28557643. The reversal of 28557629 is 92675582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28557629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28557629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66044 + ... + 66474.

It is an arithmetic number, because the mean of its divisors is an integer number (3608064).

Almost surely, 2^28557629 is an apocalyptic number.

It is an amenable number.

28557629 is a deficient number, since it is larger than the sum of its proper divisors (306883).

28557629 is a wasteful number, since it uses less digits than its factorization.

28557629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987.

The product of its digits is 302400, while the sum is 44.

The square root of 28557629 is about 5343.9338506385. The cubic root of 28557629 is about 305.6614829114.

The spelling of 28557629 in words is "twenty-eight million, five hundred fifty-seven thousand, six hundred twenty-nine".