628908338 has 4 divisors (see below), whose sum is σ = 943362510. Its totient is φ = 314454168.

The previous prime is 628908331. The next prime is 628908349. The reversal of 628908338 is 833809826.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 833809826 = 2 ⋅416904913.

It can be written as a sum of positive squares in only one way, i.e., 628655329 + 253009 = 25073^2 + 503^2 .

It is a junction number, because it is equal to n+sod(n) for n = 628908292 and 628908301.

It is not an unprimeable number, because it can be changed into a prime (628908331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157227083 + ... + 157227086.

Almost surely, 2^628908338 is an apocalyptic number.

628908338 is a deficient number, since it is larger than the sum of its proper divisors (314454172).

628908338 is a wasteful number, since it uses less digits than its factorization.

628908338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314454171.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 628908338 is about 25078.0449397476. The cubic root of 628908338 is about 856.7664483960.

The spelling of 628908338 in words is "six hundred twenty-eight million, nine hundred eight thousand, three hundred thirty-eight".