28267787890 has 16 divisors (see below), whose sum is σ = 53560019520. Its totient is φ = 10712003760.

The previous prime is 28267787839. The next prime is 28267787941. The reversal of 28267787890 is 9878776282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28267787839) and next prime (28267787941).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74388726 + ... + 74389105.

It is an arithmetic number, because the mean of its divisors is an integer number (3347501220).

Almost surely, 2^28267787890 is an apocalyptic number.

28267787890 is a deficient number, since it is larger than the sum of its proper divisors (25292231630).

28267787890 is a wasteful number, since it uses less digits than its factorization.

28267787890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148777857.

The product of its (nonzero) digits is 37933056, while the sum is 64.

The spelling of 28267787890 in words is "twenty-eight billion, two hundred sixty-seven million, seven hundred eighty-seven thousand, eight hundred ninety".