628740422 has 4 divisors (see below), whose sum is σ = 943110636. Its totient is φ = 314370210.

The previous prime is 628740401. The next prime is 628740439. The reversal of 628740422 is 224047826.

It is a happy number.

628740422 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 224047826 = 2 ⋅112023913.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157185104 + ... + 157185107.

It is an arithmetic number, because the mean of its divisors is an integer number (235777659).

Almost surely, 2^628740422 is an apocalyptic number.

628740422 is a deficient number, since it is larger than the sum of its proper divisors (314370214).

628740422 is a wasteful number, since it uses less digits than its factorization.

628740422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314370213.

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 628740422 is about 25074.6968476191. The cubic root of 628740422 is about 856.6901905421.

The spelling of 628740422 in words is "six hundred twenty-eight million, seven hundred forty thousand, four hundred twenty-two".