28628897 has 8 divisors (see below), whose sum is σ = 31583520. Its totient is φ = 25732960.

The previous prime is 28628891. The next prime is 28628909. The reversal of 28628897 is 79882682.

28628897 is nontrivially palindromic in base 14.

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

It is not a de Polignac number, because 28628897 - 2⁸ = 28628641 is a prime.

It is a super-2 number, since 2×28628897² = 1639227486873218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28628891) 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, 13643 + ... + 15600.

It is an arithmetic number, because the mean of its divisors is an integer number (3947940).

Almost surely, 2^28628897 is an apocalyptic number.

It is an amenable number.

28628897 is a deficient number, since it is larger than the sum of its proper divisors (2954623).

28628897 is a wasteful number, since it uses less digits than its factorization.

28628897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29343.

The product of its digits is 774144, while the sum is 50.

The square root of 28628897 is about 5350.5978170668. The cubic root of 28628897 is about 305.9155397925.

The spelling of 28628897 in words is "twenty-eight million, six hundred twenty-eight thousand, eight hundred ninety-seven".