728909137 has 8 divisors (see below), whose sum is σ = 795529152. Its totient is φ = 662348400.

The previous prime is 728909089. The next prime is 728909177. The reversal of 728909137 is 731909827.

It is a happy number.

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 728909137 - 2⁷ = 728909009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728909177) 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, 13212 + ... + 40402.

It is an arithmetic number, because the mean of its divisors is an integer number (99441144).

Almost surely, 2^728909137 is an apocalyptic number.

It is an amenable number.

728909137 is a deficient number, since it is larger than the sum of its proper divisors (66620015).

728909137 is a wasteful number, since it uses less digits than its factorization.

728909137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29639.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 728909137 is about 26998.3172994170. The cubic root of 728909137 is about 899.9626062653.

The spelling of 728909137 in words is "seven hundred twenty-eight million, nine hundred nine thousand, one hundred thirty-seven".