28577978 has 16 divisors (see below), whose sum is σ = 50361696. Its totient is φ = 11990640.

The previous prime is 28577977. The next prime is 28577987. The reversal of 28577978 is 87977582.

It is not an unprimeable number, because it can be changed into a prime (28577977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49676 + ... + 50247.

It is an arithmetic number, because the mean of its divisors is an integer number (3147606).

Almost surely, 2^28577978 is an apocalyptic number.

28577978 is a deficient number, since it is larger than the sum of its proper divisors (21783718).

28577978 is a wasteful number, since it uses less digits than its factorization.

28577978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99949.

The product of its digits is 1975680, while the sum is 53.

The square root of 28577978 is about 5345.8374460883. The cubic root of 28577978 is about 305.7340663035.

The spelling of 28577978 in words is "twenty-eight million, five hundred seventy-seven thousand, nine hundred seventy-eight".