28707957 has 12 divisors (see below), whose sum is σ = 41967744. Its totient is φ = 18907560.

The previous prime is 28707947. The next prime is 28707977. The reversal of 28707957 is 75970782.

It is not a de Polignac number, because 28707957 - 2²⁰ = 27659381 is a prime.

It is a super-2 number, since 2×28707957² = 1648293590227698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28707947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18469 + ... + 19962.

It is an arithmetic number, because the mean of its divisors is an integer number (3497312).

Almost surely, 2^28707957 is an apocalyptic number.

It is an amenable number.

28707957 is a deficient number, since it is larger than the sum of its proper divisors (13259787).

28707957 is a wasteful number, since it uses less digits than its factorization.

28707957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38520 (or 38517 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 28707957 is about 5357.9806830559. The cubic root of 28707957 is about 306.1968808606.

The spelling of 28707957 in words is "twenty-eight million, seven hundred seven thousand, nine hundred fifty-seven".