728056642 has 4 divisors (see below), whose sum is σ = 1092084966. Its totient is φ = 364028320.

The previous prime is 728056619. The next prime is 728056657. The reversal of 728056642 is 246650827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 477815881 + 250240761 = 21859^2 + 15819^2 .

It is a junction number, because it is equal to n+sod(n) for n = 728056595 and 728056604.

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, 182014159 + ... + 182014162.

Almost surely, 2^728056642 is an apocalyptic number.

728056642 is a deficient number, since it is larger than the sum of its proper divisors (364028324).

728056642 is a wasteful number, since it uses less digits than its factorization.

728056642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364028323.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 728056642 is about 26982.5247521428. The cubic root of 728056642 is about 899.6116192558.

The spelling of 728056642 in words is "seven hundred twenty-eight million, fifty-six thousand, six hundred forty-two".