628402671721 has 32 divisors (see below), whose sum is σ = 705960000000. Its totient is φ = 554544506880.

The previous prime is 628402671709. The next prime is 628402671769. The reversal of 628402671721 is 127176204826.

It is not a de Polignac number, because 628402671721 - 2²⁷ = 628268453993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628402671781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20093905 + ... + 20125153.

It is an arithmetic number, because the mean of its divisors is an integer number (22061250000).

Almost surely, 2^628402671721 is an apocalyptic number.

It is an amenable number.

628402671721 is a deficient number, since it is larger than the sum of its proper divisors (77557328279).

628402671721 is a wasteful number, since it uses less digits than its factorization.

628402671721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31729.

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 628402671721 in words is "six hundred twenty-eight billion, four hundred two million, six hundred seventy-one thousand, seven hundred twenty-one".