628053421 has 4 divisors (see below), whose sum is σ = 628743744. Its totient is φ = 627363100.

The previous prime is 628053403. The next prime is 628053443. The reversal of 628053421 is 124350826.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628053421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628053401) 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, 343795 + ... + 345616.

It is an arithmetic number, because the mean of its divisors is an integer number (157185936).

Almost surely, 2^628053421 is an apocalyptic number.

It is an amenable number.

628053421 is a deficient number, since it is larger than the sum of its proper divisors (690323).

628053421 is an equidigital number, since it uses as much as digits as its factorization.

628053421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690322.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 628053421 is about 25060.9940146037. The cubic root of 628053421 is about 856.3780524491.

The spelling of 628053421 in words is "six hundred twenty-eight million, fifty-three thousand, four hundred twenty-one".