628170122 has 4 divisors (see below), whose sum is σ = 942255186. Its totient is φ = 314085060.

The previous prime is 628170121. The next prime is 628170149. The reversal of 628170122 is 221071826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221071826 = 2 ⋅110535913.

It can be written as a sum of positive squares in only one way, i.e., 500909161 + 127260961 = 22381^2 + 11281^2 .

It is not an unprimeable number, because it can be changed into a prime (628170121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157042529 + ... + 157042532.

Almost surely, 2^628170122 is an apocalyptic number.

628170122 is a deficient number, since it is larger than the sum of its proper divisors (314085064).

628170122 is a wasteful number, since it uses less digits than its factorization.

628170122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314085063.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 628170122 is about 25063.3222458636. The cubic root of 628170122 is about 856.4310914541.

The spelling of 628170122 in words is "six hundred twenty-eight million, one hundred seventy thousand, one hundred twenty-two".