64728258 has 32 divisors (see below), whose sum is σ = 151562880. Its totient is φ = 18042240.

The previous prime is 64728247. The next prime is 64728263. The reversal of 64728258 is 85282746.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17073 + ... + 20516.

It is an arithmetic number, because the mean of its divisors is an integer number (4736340).

Almost surely, 2^64728258 is an apocalyptic number.

64728258 is an abundant number, since it is smaller than the sum of its proper divisors (86834622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64728258 is a wasteful number, since it uses less digits than its factorization.

64728258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37642.

The product of its digits is 215040, while the sum is 42.

The square root of 64728258 is about 8045.3873741418. The cubic root of 64728258 is about 401.5114855016.

The spelling of 64728258 in words is "sixty-four million, seven hundred twenty-eight thousand, two hundred fifty-eight".