728240730 has 64 divisors (see below), whose sum is σ = 2114968320. Its totient is φ = 156662784.

The previous prime is 728240707. The next prime is 728240803. The reversal of 728240730 is 37042827.

It is a junction number, because it is equal to n+sod(n) for n = 728240691 and 728240700.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98425 + ... + 105564.

It is an arithmetic number, because the mean of its divisors is an integer number (33046380).

Almost surely, 2^728240730 is an apocalyptic number.

728240730 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

728240730 is an abundant number, since it is smaller than the sum of its proper divisors (1386727590).

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

728240730 is a wasteful number, since it uses less digits than its factorization.

728240730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204023.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 728240730 is about 26985.9357814399. The cubic root of 728240730 is about 899.6874346701.

The spelling of 728240730 in words is "seven hundred twenty-eight million, two hundred forty thousand, seven hundred thirty".