28577371 has 4 divisors (see below), whose sum is σ = 28632744. Its totient is φ = 28522000.

The previous prime is 28577333. The next prime is 28577377. The reversal of 28577371 is 17377582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17377582 = 2 ⋅8688791.

It is a cyclic number.

It is not a de Polignac number, because 28577371 - 2¹⁵ = 28544603 is a prime.

It is a super-2 number, since 2×28577371² = 1633332266543282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28577377) 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 3 ways as a sum of consecutive naturals, for example, 26905 + ... + 27946.

It is an arithmetic number, because the mean of its divisors is an integer number (7158186).

Almost surely, 2^28577371 is an apocalyptic number.

28577371 is a deficient number, since it is larger than the sum of its proper divisors (55373).

28577371 is an equidigital number, since it uses as much as digits as its factorization.

28577371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55372.

The product of its digits is 82320, while the sum is 40.

The square root of 28577371 is about 5345.7806726427. The cubic root of 28577371 is about 305.7319016776.

The spelling of 28577371 in words is "twenty-eight million, five hundred seventy-seven thousand, three hundred seventy-one".