728557087 has 4 divisors (see below), whose sum is σ = 733197736. Its totient is φ = 723916440.

The previous prime is 728557079. The next prime is 728557139. The reversal of 728557087 is 780755827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780755827 = 9817 ⋅79531.

It is a cyclic number.

It is not a de Polignac number, because 728557087 - 2³ = 728557079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728557087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728557187) 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, 2320089 + ... + 2320402.

It is an arithmetic number, because the mean of its divisors is an integer number (183299434).

Almost surely, 2^728557087 is an apocalyptic number.

728557087 is a deficient number, since it is larger than the sum of its proper divisors (4640649).

728557087 is a wasteful number, since it uses less digits than its factorization.

728557087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4640648.

The product of its (nonzero) digits is 1097600, while the sum is 49.

The square root of 728557087 is about 26991.7966612080. The cubic root of 728557087 is about 899.8176943500.

The spelling of 728557087 in words is "seven hundred twenty-eight million, five hundred fifty-seven thousand, eighty-seven".