728621780 has 12 divisors (see below), whose sum is σ = 1530105780. Its totient is φ = 291448704.

The previous prime is 728621779. The next prime is 728621801. The reversal of 728621780 is 87126827.

It can be written as a sum of positive squares in 2 ways, for example, as 144336196 + 584285584 = 12014^2 + 24172^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18215525 + ... + 18215564.

It is an arithmetic number, because the mean of its divisors is an integer number (127508815).

Almost surely, 2^728621780 is an apocalyptic number.

It is an amenable number.

728621780 is an abundant number, since it is smaller than the sum of its proper divisors (801484000).

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

728621780 is a wasteful number, since it uses less digits than its factorization.

728621780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36431098 (or 36431096 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 728621780 is about 26992.9950172262. The cubic root of 728621780 is about 899.8443269843.

The spelling of 728621780 in words is "seven hundred twenty-eight million, six hundred twenty-one thousand, seven hundred eighty".