628403242 has 4 divisors (see below), whose sum is σ = 942604866. Its totient is φ = 314201620.

The previous prime is 628403231. The next prime is 628403267. The reversal of 628403242 is 242304826.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 574512961 + 53890281 = 23969^2 + 7341^2 .

It is a super-2 number, since 2×628403242² = 789781269112221128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157100809 + ... + 157100812.

Almost surely, 2^628403242 is an apocalyptic number.

628403242 is a deficient number, since it is larger than the sum of its proper divisors (314201624).

628403242 is a wasteful number, since it uses less digits than its factorization.

628403242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314201623.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 628403242 is about 25067.9724349617. The cubic root of 628403242 is about 856.5370216348.

The spelling of 628403242 in words is "six hundred twenty-eight million, four hundred three thousand, two hundred forty-two".