728158665 has 32 divisors (see below), whose sum is σ = 1257572736. Its totient is φ = 357649920.

The previous prime is 728158663. The next prime is 728158681. The reversal of 728158665 is 566851827.

It is not a de Polignac number, because 728158665 - 2¹ = 728158663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728158661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85030 + ... + 93200.

It is an arithmetic number, because the mean of its divisors is an integer number (39299148).

Almost surely, 2^728158665 is an apocalyptic number.

It is an amenable number.

728158665 is a deficient number, since it is larger than the sum of its proper divisors (529414071).

728158665 is a wasteful number, since it uses less digits than its factorization.

728158665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8649.

The product of its digits is 806400, while the sum is 48.

The square root of 728158665 is about 26984.4152243476. The cubic root of 728158665 is about 899.6536383260.

The spelling of 728158665 in words is "seven hundred twenty-eight million, one hundred fifty-eight thousand, six hundred sixty-five".