728754638 has 8 divisors (see below), whose sum is σ = 1095886632. Its totient is φ = 363459096.

The previous prime is 728754577. The next prime is 728754647. The reversal of 728754638 is 836457827.

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

It is a super-2 number, since 2×728754638² = 1062166644813022088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458120 + ... + 459707.

It is an arithmetic number, because the mean of its divisors is an integer number (136985829).

Almost surely, 2^728754638 is an apocalyptic number.

728754638 is a deficient number, since it is larger than the sum of its proper divisors (367131994).

728754638 is a wasteful number, since it uses less digits than its factorization.

728754638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918226.

The product of its digits is 2257920, while the sum is 50.

The square root of 728754638 is about 26995.4558768694. The cubic root of 728754638 is about 899.8990166533.

The spelling of 728754638 in words is "seven hundred twenty-eight million, seven hundred fifty-four thousand, six hundred thirty-eight".