28640129 has 8 divisors (see below), whose sum is σ = 34154880. Its totient is φ = 23481216.

The previous prime is 28640119. The next prime is 28640147. The reversal of 28640129 is 92104682.

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-28640129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28640095 and 28640104.

It is not an unprimeable number, because it can be changed into a prime (28640119) 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, 88784 + ... + 89105.

It is an arithmetic number, because the mean of its divisors is an integer number (4269360).

Almost surely, 2^28640129 is an apocalyptic number.

It is an amenable number.

28640129 is a deficient number, since it is larger than the sum of its proper divisors (5514751).

28640129 is a wasteful number, since it uses less digits than its factorization.

28640129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177919.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28640129 is about 5351.6473164812. The cubic root of 28640129 is about 305.9555412647.

The spelling of 28640129 in words is "twenty-eight million, six hundred forty thousand, one hundred twenty-nine".