728051491 has 8 divisors (see below), whose sum is σ = 732672000. Its totient is φ = 723442440.

The previous prime is 728051477. The next prime is 728051497. The reversal of 728051491 is 194150827.

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

It is a cyclic number.

It is not a de Polignac number, because 728051491 - 2⁹ = 728050979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728051491.

It is not an unprimeable number, because it can be changed into a prime (728051497) 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, 149310 + ... + 154108.

It is an arithmetic number, because the mean of its divisors is an integer number (91584000).

Almost surely, 2^728051491 is an apocalyptic number.

728051491 is a deficient number, since it is larger than the sum of its proper divisors (4620509).

728051491 is a wasteful number, since it uses less digits than its factorization.

728051491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5729.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 728051491 is about 26982.4293013064. The cubic root of 728051491 is about 899.6094976671.

The spelling of 728051491 in words is "seven hundred twenty-eight million, fifty-one thousand, four hundred ninety-one".