728521140 has 24 divisors (see below), whose sum is σ = 2039859360. Its totient is φ = 194272288.

The previous prime is 728521139. The next prime is 728521147. The reversal of 728521140 is 41125827.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 728521098 and 728521107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728521147) 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, 6070950 + ... + 6071069.

It is an arithmetic number, because the mean of its divisors is an integer number (84994140).

Almost surely, 2^728521140 is an apocalyptic number.

It is an amenable number.

728521140 is an abundant number, since it is smaller than the sum of its proper divisors (1311338220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728521140 is a wasteful number, since it uses less digits than its factorization.

728521140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12142031 (or 12142029 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 728521140 is about 26991.1307654941. The cubic root of 728521140 is about 899.8028951077.

Adding to 728521140 its reverse (41125827), we get a palindrome (769646967).

The spelling of 728521140 in words is "seven hundred twenty-eight million, five hundred twenty-one thousand, one hundred forty".