628421992 has 16 divisors (see below), whose sum is σ = 1285408800. Its totient is φ = 285646320.

The previous prime is 628421957. The next prime is 628422001. The reversal of 628421992 is 299124826.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3570492 + ... + 3570667.

It is an arithmetic number, because the mean of its divisors is an integer number (80338050).

Almost surely, 2^628421992 is an apocalyptic number.

It is an amenable number.

628421992 is an abundant number, since it is smaller than the sum of its proper divisors (656986808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628421992 is a wasteful number, since it uses less digits than its factorization.

628421992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141176 (or 7141172 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 628421992 is about 25068.3464153502. The cubic root of 628421992 is about 856.5455405329.

The spelling of 628421992 in words is "six hundred twenty-eight million, four hundred twenty-one thousand, nine hundred ninety-two".