28634397 has 16 divisors (see below), whose sum is σ = 43087680. Its totient is φ = 16755200.

The previous prime is 28634329. The next prime is 28634399. The reversal of 28634397 is 79343682.

It is not a de Polignac number, because 28634397 - 2⁷ = 28634269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28634399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14004 + ... + 15917.

It is an arithmetic number, because the mean of its divisors is an integer number (2692980).

Almost surely, 2^28634397 is an apocalyptic number.

It is an amenable number.

28634397 is a deficient number, since it is larger than the sum of its proper divisors (14453283).

28634397 is a wasteful number, since it uses less digits than its factorization.

28634397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29964.

The product of its digits is 217728, while the sum is 42.

The square root of 28634397 is about 5351.1117536452. Note that the first 3 decimals coincide. The cubic root of 28634397 is about 305.9351287150.

It can be divided in two parts, 2863 and 4397, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 28634397 in words is "twenty-eight million, six hundred thirty-four thousand, three hundred ninety-seven".