728180997 has 8 divisors (see below), whose sum is σ = 971710656. Its totient is φ = 485052672.

The previous prime is 728180983. The next prime is 728181007. The reversal of 728180997 is 799081827.

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

It is not a de Polignac number, because 728180997 - 2⁶ = 728180933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728180597) 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, 96073 + ... + 103374.

It is an arithmetic number, because the mean of its divisors is an integer number (121463832).

Almost surely, 2^728180997 is an apocalyptic number.

It is an amenable number.

728180997 is a deficient number, since it is larger than the sum of its proper divisors (243529659).

728180997 is a wasteful number, since it uses less digits than its factorization.

728180997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200667.

The product of its (nonzero) digits is 508032, while the sum is 51.

The square root of 728180997 is about 26984.8290155784. The cubic root of 728180997 is about 899.6628354331.

The spelling of 728180997 in words is "seven hundred twenty-eight million, one hundred eighty thousand, nine hundred ninety-seven".