28297628 has 6 divisors (see below), whose sum is σ = 49520856. Its totient is φ = 14148812.

The previous prime is 28297603. The next prime is 28297657. The reversal of 28297628 is 82679282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3537200 + ... + 3537207.

It is an arithmetic number, because the mean of its divisors is an integer number (8253476).

Almost surely, 2^28297628 is an apocalyptic number.

It is an amenable number.

28297628 is a deficient number, since it is larger than the sum of its proper divisors (21223228).

28297628 is a wasteful number, since it uses less digits than its factorization.

28297628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7074411 (or 7074409 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 28297628 is about 5319.5514848528. The cubic root of 28297628 is about 304.7310286599.

The spelling of 28297628 in words is "twenty-eight million, two hundred ninety-seven thousand, six hundred twenty-eight".