728787 has 8 divisors (see below), whose sum is σ = 976336. Its totient is φ = 483552.

The previous prime is 728771. The next prime is 728809. The reversal of 728787 is 787827.

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

It is not a de Polignac number, because 728787 - 2⁴ = 728771 is a prime.

It is a super-2 number, since 2×728787² = 1062260982738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728787.

It is not an unprimeable number, because it can be changed into a prime (728747) 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, 393 + ... + 1269.

It is an arithmetic number, because the mean of its divisors is an integer number (122042).

2⁷²⁸⁷⁸⁷ is an apocalyptic number.

728787 is a deficient number, since it is larger than the sum of its proper divisors (247549).

728787 is a wasteful number, since it uses less digits than its factorization.

728787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157.

The product of its digits is 43904, while the sum is 39.

The square root of 728787 is about 853.6902248474. The cubic root of 728787 is about 89.9912337141.

The spelling of 728787 in words is "seven hundred twenty-eight thousand, seven hundred eighty-seven".