728340680 has 32 divisors (see below), whose sum is σ = 1725019200. Its totient is φ = 276002496.

The previous prime is 728340653. The next prime is 728340689. The reversal of 728340680 is 86043827.

It is a super-2 number, since 2×728340680² = 1060960292285724800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (728340689) 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, 478412 + ... + 479931.

It is an arithmetic number, because the mean of its divisors is an integer number (53906850).

Almost surely, 2^728340680 is an apocalyptic number.

It is an amenable number.

728340680 is an abundant number, since it is smaller than the sum of its proper divisors (996678520).

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

728340680 is a wasteful number, since it uses less digits than its factorization.

728340680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958373 (or 958369 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 728340680 is about 26987.7876084721. The cubic root of 728340680 is about 899.7285930590.

The spelling of 728340680 in words is "seven hundred twenty-eight million, three hundred forty thousand, six hundred eighty".