628178233 has 2 divisors, whose sum is σ = 628178234. Its totient is φ = 628178232.

The previous prime is 628178219. The next prime is 628178249. The reversal of 628178233 is 332871826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471628089 + 156550144 = 21717^2 + 12512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628178233 is a prime.

It is not a weakly prime, because it can be changed into another prime (628178263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314089116 + 314089117.

It is an arithmetic number, because the mean of its divisors is an integer number (314089117).

Almost surely, 2^628178233 is an apocalyptic number.

It is an amenable number.

628178233 is a deficient number, since it is larger than the sum of its proper divisors (1).

628178233 is an equidigital number, since it uses as much as digits as its factorization.

628178233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 628178233 is about 25063.4840554940. The cubic root of 628178233 is about 856.4347775483.

The spelling of 628178233 in words is "six hundred twenty-eight million, one hundred seventy-eight thousand, two hundred thirty-three".