728285157 has 12 divisors (see below), whose sum is σ = 1066378924. Its totient is φ = 478872000.

The previous prime is 728285153. The next prime is 728285177. The reversal of 728285157 is 751582827.

It can be written as a sum of positive squares in 2 ways, for example, as 593701956 + 134583201 = 24366^2 + 11601^2 .

It is not a de Polignac number, because 728285157 - 2² = 728285153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728285153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553594 + ... + 554907.

Almost surely, 2^728285157 is an apocalyptic number.

It is an amenable number.

728285157 is a deficient number, since it is larger than the sum of its proper divisors (338093767).

728285157 is a wasteful number, since it uses less digits than its factorization.

728285157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108580 (or 1108577 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 728285157 is about 26986.7589198851. The cubic root of 728285157 is about 899.7057297197.

The spelling of 728285157 in words is "seven hundred twenty-eight million, two hundred eighty-five thousand, one hundred fifty-seven".