728627891 has 4 divisors (see below), whose sum is σ = 730716000. Its totient is φ = 726539784.

The previous prime is 728627869. The next prime is 728627897. The reversal of 728627891 is 198726827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728627891 - 2¹⁸ = 728365747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728627897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043531 + ... + 1044228.

It is an arithmetic number, because the mean of its divisors is an integer number (182679000).

Almost surely, 2^728627891 is an apocalyptic number.

728627891 is a deficient number, since it is larger than the sum of its proper divisors (2088109).

728627891 is a wasteful number, since it uses less digits than its factorization.

728627891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088108.

The product of its digits is 677376, while the sum is 50.

The square root of 728627891 is about 26993.1082130236. The cubic root of 728627891 is about 899.8468426622.

The spelling of 728627891 in words is "seven hundred twenty-eight million, six hundred twenty-seven thousand, eight hundred ninety-one".