628374021 has 8 divisors (see below), whose sum is σ = 913998624. Its totient is φ = 380832720.

The previous prime is 628374017. The next prime is 628374031. The reversal of 628374021 is 120473826.

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

It is not a de Polignac number, because 628374021 - 2² = 628374017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 19041637 = 628374021 / (6 + 2 + 8 + 3 + 7 + 4 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628374011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9520786 + ... + 9520851.

It is an arithmetic number, because the mean of its divisors is an integer number (114249828).

Almost surely, 2^628374021 is an apocalyptic number.

It is an amenable number.

628374021 is a deficient number, since it is larger than the sum of its proper divisors (285624603).

628374021 is a wasteful number, since it uses less digits than its factorization.

628374021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19041651.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 628374021 is about 25067.3895928555. The cubic root of 628374021 is about 856.5237449920.

The spelling of 628374021 in words is "six hundred twenty-eight million, three hundred seventy-four thousand, twenty-one".