628586421 has 8 divisors (see below), whose sum is σ = 838642560. Its totient is φ = 418793952.

The previous prime is 628586417. The next prime is 628586423. The reversal of 628586421 is 124685826.

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

It is not a de Polignac number, because 628586421 - 2² = 628586417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628586423) 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, 60285 + ... + 69938.

It is an arithmetic number, because the mean of its divisors is an integer number (104830320).

Almost surely, 2^628586421 is an apocalyptic number.

It is an amenable number.

628586421 is a deficient number, since it is larger than the sum of its proper divisors (210056139).

628586421 is a wasteful number, since it uses less digits than its factorization.

628586421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131835.

The product of its digits is 184320, while the sum is 42.

The square root of 628586421 is about 25071.6258148529. The cubic root of 628586421 is about 856.6202401489.

The spelling of 628586421 in words is "six hundred twenty-eight million, five hundred eighty-six thousand, four hundred twenty-one".