728020557 has 24 divisors (see below), whose sum is σ = 1151587008. Its totient is φ = 439531200.

The previous prime is 728020537. The next prime is 728020577. The reversal of 728020557 is 755020827.

728020557 is a `hidden beast` number, since 7 + 2 + 80 + 20 + 557 = 666.

It is an interprime number because it is at equal distance from previous prime (728020537) and next prime (728020577).

It is not a de Polignac number, because 728020557 - 2¹² = 728016461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728020507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12057 + ... + 40017.

It is an arithmetic number, because the mean of its divisors is an integer number (47982792).

Almost surely, 2^728020557 is an apocalyptic number.

It is an amenable number.

728020557 is a deficient number, since it is larger than the sum of its proper divisors (423566451).

728020557 is a wasteful number, since it uses less digits than its factorization.

728020557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28241 (or 28238 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 728020557 is about 26981.8560703299. The cubic root of 728020557 is about 899.5967563913.

The spelling of 728020557 in words is "seven hundred twenty-eight million, twenty thousand, five hundred fifty-seven".