728051644 has 12 divisors (see below), whose sum is σ = 1274568624. Its totient is φ = 363889184.

The previous prime is 728051629. The next prime is 728051659. The reversal of 728051644 is 446150827.

It is an interprime number because it is at equal distance from previous prime (728051629) and next prime (728051659).

It is a super-2 number, since 2×728051644² = 1060118392662205472, 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, 21664 + ... + 43879.

It is an arithmetic number, because the mean of its divisors is an integer number (106214052).

Almost surely, 2^728051644 is an apocalyptic number.

It is an amenable number.

728051644 is a deficient number, since it is larger than the sum of its proper divisors (546516980).

728051644 is a wasteful number, since it uses less digits than its factorization.

728051644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68324 (or 68322 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 728051644 is about 26982.4321364847. The cubic root of 728051644 is about 899.6095606847.

The spelling of 728051644 in words is "seven hundred twenty-eight million, fifty-one thousand, six hundred forty-four".