728400641 has 8 divisors (see below), whose sum is σ = 734409504. Its totient is φ = 722402080.

The previous prime is 728400623. The next prime is 728400679. The reversal of 728400641 is 146004827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728400641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728400598 and 728400607.

It is not an unprimeable number, because it can be changed into a prime (728400691) 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, 206906 + ... + 210396.

It is an arithmetic number, because the mean of its divisors is an integer number (91801188).

Almost surely, 2^728400641 is an apocalyptic number.

It is an amenable number.

728400641 is a deficient number, since it is larger than the sum of its proper divisors (6008863).

728400641 is a wasteful number, since it uses less digits than its factorization.

728400641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 728400641 is about 26988.8984769664. The cubic root of 728400641 is about 899.7532825792.

The spelling of 728400641 in words is "seven hundred twenty-eight million, four hundred thousand, six hundred forty-one".