28957977 has 6 divisors (see below), whose sum is σ = 41828202. Its totient is φ = 19305312.

The previous prime is 28957961. The next prime is 28957991. The reversal of 28957977 is 77975982.

It can be written as a sum of positive squares in only one way, i.e., 28933641 + 24336 = 5379^2 + 156^2 .

It is not a de Polignac number, because 28957977 - 2⁴ = 28957961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28957927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1608768 + ... + 1608785.

It is an arithmetic number, because the mean of its divisors is an integer number (6971367).

Almost surely, 2^28957977 is an apocalyptic number.

It is an amenable number.

28957977 is a deficient number, since it is larger than the sum of its proper divisors (12870225).

28957977 is a wasteful number, since it uses less digits than its factorization.

28957977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217559 (or 3217556 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 28957977 is about 5381.2616550396. The cubic root of 28957977 is about 307.0832108648.

The spelling of 28957977 in words is "twenty-eight million, nine hundred fifty-seven thousand, nine hundred seventy-seven".