728158057 has 4 divisors (see below), whose sum is σ = 794354256. Its totient is φ = 661961860.

The previous prime is 728158051. The next prime is 728158069. The reversal of 728158057 is 750851827.

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.

It is a cyclic number.

It is not a de Polignac number, because 728158057 - 2³ = 728158049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728158051) 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, 33098083 + ... + 33098104.

It is an arithmetic number, because the mean of its divisors is an integer number (198588564).

Almost surely, 2^728158057 is an apocalyptic number.

It is an amenable number.

728158057 is a deficient number, since it is larger than the sum of its proper divisors (66196199).

728158057 is a wasteful number, since it uses less digits than its factorization.

728158057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66196198.

The product of its (nonzero) digits is 156800, while the sum is 43.

The square root of 728158057 is about 26984.4039585832. The cubic root of 728158057 is about 899.6533879275.

The spelling of 728158057 in words is "seven hundred twenty-eight million, one hundred fifty-eight thousand, fifty-seven".