728405540 has 48 divisors (see below), whose sum is σ = 1545433344. Its totient is φ = 288374400.

The previous prime is 728405519. The next prime is 728405567. The reversal of 728405540 is 45504827.

It is a self number, because there is not a number n which added to its sum of digits gives 728405540.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125497 + ... + 1126143.

It is an arithmetic number, because the mean of its divisors is an integer number (32196528).

Almost surely, 2^728405540 is an apocalyptic number.

It is an amenable number.

728405540 is an abundant number, since it is smaller than the sum of its proper divisors (817027804).

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

728405540 is a wasteful number, since it uses less digits than its factorization.

728405540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1146 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 728405540 is about 26988.9892363534. The cubic root of 728405540 is about 899.7552997298.

The spelling of 728405540 in words is "seven hundred twenty-eight million, four hundred five thousand, five hundred forty".