28972057 has 4 divisors (see below), whose sum is σ = 29270836. Its totient is φ = 28673280.

The previous prime is 28972049. The next prime is 28972087. The reversal of 28972057 is 75027982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75027982 = 2 ⋅37513991.

It can be written as a sum of positive squares in 2 ways, for example, as 11964681 + 17007376 = 3459^2 + 4124^2 .

It is a cyclic number.

It is not a de Polignac number, because 28972057 - 2³ = 28972049 is a prime.

It is a super-2 number, since 2×28972057² = 1678760173622498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28972037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149244 + ... + 149437.

It is an arithmetic number, because the mean of its divisors is an integer number (7317709).

Almost surely, 2^28972057 is an apocalyptic number.

It is an amenable number.

28972057 is a deficient number, since it is larger than the sum of its proper divisors (298779).

28972057 is an equidigital number, since it uses as much as digits as its factorization.

28972057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298778.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 28972057 is about 5382.5697394460. The cubic root of 28972057 is about 307.1329729854.

The spelling of 28972057 in words is "twenty-eight million, nine hundred seventy-two thousand, fifty-seven".