28577961 has 8 divisors (see below), whose sum is σ = 42337760. Its totient is φ = 19051956.

The previous prime is 28577959. The next prime is 28577977. The reversal of 28577961 is 16977582.

It is not a de Polignac number, because 28577961 - 2¹ = 28577959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28577911) 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, 529195 + ... + 529248.

It is an arithmetic number, because the mean of its divisors is an integer number (5292220).

Almost surely, 2^28577961 is an apocalyptic number.

It is an amenable number.

28577961 is a deficient number, since it is larger than the sum of its proper divisors (13759799).

28577961 is a wasteful number, since it uses less digits than its factorization.

28577961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058452 (or 1058446 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 28577961 is about 5345.8358560659. The cubic root of 28577961 is about 305.7340056801.

The spelling of 28577961 in words is "twenty-eight million, five hundred seventy-seven thousand, nine hundred sixty-one".