728648156057 has 4 divisors (see below), whose sum is σ = 735457952016. Its totient is φ = 721838360100.

The previous prime is 728648156039. The next prime is 728648156111. The reversal of 728648156057 is 750651846827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 750651846827 = 229 ⋅3277955663.

It is a cyclic number.

It is not a de Polignac number, because 728648156057 - 2⁸ = 728648155801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728648155987 and 728648156005.

It is not an unprimeable number, because it can be changed into a prime (728648056057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3404897819 + ... + 3404898032.

It is an arithmetic number, because the mean of its divisors is an integer number (183864488004).

Almost surely, 2^728648156057 is an apocalyptic number.

It is an amenable number.

728648156057 is a deficient number, since it is larger than the sum of its proper divisors (6809795959).

728648156057 is a wasteful number, since it uses less digits than its factorization.

728648156057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809795958.

The product of its (nonzero) digits is 22579200, while the sum is 59.

The spelling of 728648156057 in words is "seven hundred twenty-eight billion, six hundred forty-eight million, one hundred fifty-six thousand, fifty-seven".