728857321534 has 8 divisors (see below), whose sum is σ = 1093484022048. Its totient is φ = 364362647520.

The previous prime is 728857321519. The next prime is 728857321537. The reversal of 728857321534 is 435123758827.

It is a happy number.

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

It is a super-2 number, since 2×728857321534² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728857321537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32992822 + ... + 33014905.

It is an arithmetic number, because the mean of its divisors is an integer number (136685502756).

Almost surely, 2^728857321534 is an apocalyptic number.

728857321534 is a deficient number, since it is larger than the sum of its proper divisors (364626700514).

728857321534 is a wasteful number, since it uses less digits than its factorization.

728857321534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66013250.

The product of its digits is 11289600, while the sum is 55.

The spelling of 728857321534 in words is "seven hundred twenty-eight billion, eight hundred fifty-seven million, three hundred twenty-one thousand, five hundred thirty-four".