28999569 has 8 divisors (see below), whose sum is σ = 40940640. Its totient is φ = 18195776.

The previous prime is 28999549. The next prime is 28999577. The reversal of 28999569 is 96599982.

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

It is a cyclic number.

It is not a de Polignac number, because 28999569 - 2⁹ = 28999057 is a prime.

It is a super-2 number, since 2×28999569² = 1681950004371522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28999549) 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, 284259 + ... + 284360.

It is an arithmetic number, because the mean of its divisors is an integer number (5117580).

Almost surely, 2^28999569 is an apocalyptic number.

It is an amenable number.

28999569 is a deficient number, since it is larger than the sum of its proper divisors (11941071).

28999569 is a wasteful number, since it uses less digits than its factorization.

28999569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568639.

The product of its digits is 3149280, while the sum is 57.

The square root of 28999569 is about 5385.1247896404. The cubic root of 28999569 is about 307.2301605282.

The spelling of 28999569 in words is "twenty-eight million, nine hundred ninety-nine thousand, five hundred sixty-nine".