28078576648 has 8 divisors (see below), whose sum is σ = 52647331230. Its totient is φ = 14039288320.

The previous prime is 28078576607. The next prime is 28078576657. The reversal of 28078576648 is 84667587082.

It can be written as a sum of positive squares in only one way, i.e., 21112671204 + 6965905444 = 145302^2 + 83462^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28078576648² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1754911033 + ... + 1754911048.

Almost surely, 2^28078576648 is an apocalyptic number.

It is an amenable number.

28078576648 is a deficient number, since it is larger than the sum of its proper divisors (24568754582).

28078576648 is a wasteful number, since it uses less digits than its factorization.

28078576648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509822087 (or 3509822083 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 61.

The spelling of 28078576648 in words is "twenty-eight billion, seventy-eight million, five hundred seventy-six thousand, six hundred forty-eight".