728051649 has 16 divisors (see below), whose sum is σ = 1050672000. Its totient is φ = 445775616.

The previous prime is 728051629. The next prime is 728051659. The reversal of 728051649 is 946150827.

It is not a de Polignac number, because 728051649 - 2⁸ = 728051393 is a prime.

It is a super-2 number, since 2×728051649² = 1060118407223238402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728051649.

It is not an unprimeable number, because it can be changed into a prime (728051629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39144 + ... + 54665.

It is an arithmetic number, because the mean of its divisors is an integer number (65667000).

Almost surely, 2^728051649 is an apocalyptic number.

It is an amenable number.

728051649 is a deficient number, since it is larger than the sum of its proper divisors (322620351).

728051649 is a wasteful number, since it uses less digits than its factorization.

728051649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94024.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 728051649 is about 26982.4322291375. The cubic root of 728051649 is about 899.6095627441.

The spelling of 728051649 in words is "seven hundred twenty-eight million, fifty-one thousand, six hundred forty-nine".