628053721 has 9 divisors (see below), whose sum is σ = 663351861. Its totient is φ = 594547164.

The previous prime is 628053697. The next prime is 628053737. The reversal of 628053721 is 127350826.

It is a happy number.

The square root of 628053721 is 25061.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 628053721 - 2¹¹ = 628051673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628053121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 475500 + ... + 476818.

Almost surely, 2^628053721 is an apocalyptic number.

628053721 is the 25061-st square number.

628053721 is the 12531-st centered octagonal number.

It is an amenable number.

628053721 is a deficient number, since it is larger than the sum of its proper divisors (35298140).

628053721 is an frugal number, since it uses more digits than its factorization.

628053721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676 (or 1338 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The cubic root of 628053721 is about 856.3781888034.

The spelling of 628053721 in words is "six hundred twenty-eight million, fifty-three thousand, seven hundred twenty-one".