28312900778 has 32 divisors (see below), whose sum is σ = 44704814976. Its totient is φ = 13422574528.

The previous prime is 28312900751. The next prime is 28312900789. The reversal of 28312900778 is 87700921382.

It is a super-3 number, since 3×28312900778³ (a number of 32 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2756300 + ... + 2766552.

It is an arithmetic number, because the mean of its divisors is an integer number (1397025468).

Almost surely, 2^28312900778 is an apocalyptic number.

28312900778 is a deficient number, since it is larger than the sum of its proper divisors (16391914198).

28312900778 is a wasteful number, since it uses less digits than its factorization.

28312900778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10798.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 28312900778 in words is "twenty-eight billion, three hundred twelve million, nine hundred thousand, seven hundred seventy-eight".