28457971 has 2 divisors, whose sum is σ = 28457972. Its totient is φ = 28457970.

The previous prime is 28457963. The next prime is 28457993. The reversal of 28457971 is 17975482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28457971 - 2³ = 28457963 is a prime.

It is a super-2 number, since 2×28457971² = 1619712226873682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28457911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14228985 + 14228986.

It is an arithmetic number, because the mean of its divisors is an integer number (14228986).

Almost surely, 2^28457971 is an apocalyptic number.

28457971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28457971 is an equidigital number, since it uses as much as digits as its factorization.

28457971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 28457971 is about 5334.6012971918. The cubic root of 28457971 is about 305.3055113069.

It can be divided in two parts, 2845 and 7971, that added together give a square (10816 = 104²).

The spelling of 28457971 in words is "twenty-eight million, four hundred fifty-seven thousand, nine hundred seventy-one".