628799021 has 8 divisors (see below), whose sum is σ = 631176000. Its totient is φ = 626427648.

The previous prime is 628798997. The next prime is 628799023. The reversal of 628799021 is 120997826.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 628799021 - 2⁶ = 628798957 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 (628799023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418730 + ... + 420228.

It is an arithmetic number, because the mean of its divisors is an integer number (78897000).

Almost surely, 2^628799021 is an apocalyptic number.

It is an amenable number.

628799021 is a deficient number, since it is larger than the sum of its proper divisors (2376979).

628799021 is a wasteful number, since it uses less digits than its factorization.

628799021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 628799021 is about 25075.8653090975. The cubic root of 628799021 is about 856.7168044022.

The spelling of 628799021 in words is "six hundred twenty-eight million, seven hundred ninety-nine thousand, twenty-one".