28007957 has 4 divisors (see below), whose sum is σ = 29482080. Its totient is φ = 26533836.

The previous prime is 28007909. The next prime is 28007971. The reversal of 28007957 is 75970082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28007957 - 2²² = 23813653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28007957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28003957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737033 + ... + 737070.

It is an arithmetic number, because the mean of its divisors is an integer number (7370520).

Almost surely, 2^28007957 is an apocalyptic number.

It is an amenable number.

28007957 is a deficient number, since it is larger than the sum of its proper divisors (1474123).

28007957 is a wasteful number, since it uses less digits than its factorization.

28007957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474122.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 28007957 is about 5292.2544345487. The cubic root of 28007957 is about 303.6876589138.

The spelling of 28007957 in words is "twenty-eight million, seven thousand, nine hundred fifty-seven".