628964421 has 8 divisors (see below), whose sum is σ = 839543424. Its totient is φ = 418847520.

The previous prime is 628964411. The next prime is 628964431. The reversal of 628964421 is 124469826.

It is an interprime number because it is at equal distance from previous prime (628964411) and next prime (628964431).

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

It is not a de Polignac number, because 628964421 - 2⁵ = 628964389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628964411) 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, 112336 + ... + 117801.

It is an arithmetic number, because the mean of its divisors is an integer number (104942928).

Almost surely, 2^628964421 is an apocalyptic number.

It is an amenable number.

628964421 is a deficient number, since it is larger than the sum of its proper divisors (210579003).

628964421 is a wasteful number, since it uses less digits than its factorization.

628964421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231051.

The product of its digits is 165888, while the sum is 42.

The square root of 628964421 is about 25079.1630841222. The cubic root of 628964421 is about 856.7919150667.

The spelling of 628964421 in words is "six hundred twenty-eight million, nine hundred sixty-four thousand, four hundred twenty-one".