728392774568 has 16 divisors (see below), whose sum is σ = 1374435412980. Its totient is φ = 361876664448.

The previous prime is 728392774553. The next prime is 728392774619. The reversal of 728392774568 is 865477293827.

It can be written as a sum of positive squares in 2 ways, for example, as 703951204324 + 24441570244 = 839018^2 + 156338^2 .

It is a junction number, because it is equal to n+sod(n) for n = 728392774498 and 728392774507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289964021 + ... + 289966532.

Almost surely, 2^728392774568 is an apocalyptic number.

It is an amenable number.

728392774568 is a deficient number, since it is larger than the sum of its proper divisors (646042638412).

728392774568 is a wasteful number, since it uses less digits than its factorization.

728392774568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579930716 (or 579930712 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 68.

The spelling of 728392774568 in words is "seven hundred twenty-eight billion, three hundred ninety-two million, seven hundred seventy-four thousand, five hundred sixty-eight".