728887757 has 8 divisors (see below), whose sum is σ = 785757336. Its totient is φ = 672132672.

The previous prime is 728887741. The next prime is 728887787. The reversal of 728887757 is 757788827.

It can be written as a sum of positive squares in 4 ways, for example, as 121462441 + 607425316 = 11021^2 + 24646^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728887757 - 2⁴ = 728887741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 728887696 and 728887705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728887787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15158 + ... + 41079.

It is an arithmetic number, because the mean of its divisors is an integer number (98219667).

Almost surely, 2^728887757 is an apocalyptic number.

It is an amenable number.

728887757 is a deficient number, since it is larger than the sum of its proper divisors (56869579).

728887757 is a wasteful number, since it uses less digits than its factorization.

728887757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57247.

The product of its digits is 12293120, while the sum is 59.

The square root of 728887757 is about 26997.9213459111. The cubic root of 728887757 is about 899.9538070942.

The spelling of 728887757 in words is "seven hundred twenty-eight million, eight hundred eighty-seven thousand, seven hundred fifty-seven".