28011577 has 8 divisors (see below), whose sum is σ = 31208832. Its totient is φ = 24922800.

The previous prime is 28011551. The next prime is 28011611. The reversal of 28011577 is 77511082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28011577 - 2⁷ = 28011449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28011527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26574 + ... + 27607.

It is an arithmetic number, because the mean of its divisors is an integer number (3901104).

Almost surely, 2^28011577 is an apocalyptic number.

It is an amenable number.

28011577 is a deficient number, since it is larger than the sum of its proper divisors (3197255).

28011577 is a wasteful number, since it uses less digits than its factorization.

28011577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54239.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 28011577 is about 5292.5964327540. The cubic root of 28011577 is about 303.7007421240.

The spelling of 28011577 in words is "twenty-eight million, eleven thousand, five hundred seventy-seven".