28671577 has 16 divisors (see below), whose sum is σ = 31990464. Its totient is φ = 25480000.

The previous prime is 28671557. The next prime is 28671611. The reversal of 28671577 is 77517682.

It is a cyclic number.

It is not a de Polignac number, because 28671577 - 2¹⁵ = 28638809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28671527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145443 + ... + 145639.

It is an arithmetic number, because the mean of its divisors is an integer number (1999404).

Almost surely, 2^28671577 is an apocalyptic number.

It is an amenable number.

28671577 is a deficient number, since it is larger than the sum of its proper divisors (3318887).

28671577 is a wasteful number, since it uses less digits than its factorization.

28671577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its digits is 164640, while the sum is 43.

The square root of 28671577 is about 5354.5846711020. The cubic root of 28671577 is about 306.0674840839.

It can be divided in two parts, 2867 and 1577, that added together give a palindrome (4444).

The spelling of 28671577 in words is "twenty-eight million, six hundred seventy-one thousand, five hundred seventy-seven".