28778951744 has 14 divisors (see below), whose sum is σ = 57108232494. Its totient is φ = 14389475840.

The previous prime is 28778951741. The next prime is 28778951767. The reversal of 28778951744 is 44715987782.

It can be written as a sum of positive squares in only one way, i.e., 28696360000 + 82591744 = 169400^2 + 9088^2 .

It is not an unprimeable number, because it can be changed into a prime (28778951741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224835497 + ... + 224835624.

Almost surely, 2^28778951744 is an apocalyptic number.

It is an amenable number.

28778951744 is a deficient number, since it is larger than the sum of its proper divisors (28329280750).

28778951744 is an equidigital number, since it uses as much as digits as its factorization.

28778951744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449671133 (or 449671123 counting only the distinct ones).

The product of its digits is 31610880, while the sum is 62.

The spelling of 28778951744 in words is "twenty-eight billion, seven hundred seventy-eight million, nine hundred fifty-one thousand, seven hundred forty-four".