728644477 has 8 divisors (see below), whose sum is σ = 809883360. Its totient is φ = 649905360.

The previous prime is 728644403. The next prime is 728644481. The reversal of 728644477 is 774446827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728644477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728644477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728644877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 624327 + ... + 625492.

It is an arithmetic number, because the mean of its divisors is an integer number (101235420).

Almost surely, 2^728644477 is an apocalyptic number.

It is an amenable number.

728644477 is a deficient number, since it is larger than the sum of its proper divisors (81238883).

728644477 is a wasteful number, since it uses less digits than its factorization.

728644477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249883.

The product of its digits is 2107392, while the sum is 49.

The square root of 728644477 is about 26993.4154378434. The cubic root of 728644477 is about 899.8536704485.

The spelling of 728644477 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, four hundred seventy-seven".