628776722 has 54 divisors (see below), whose sum is σ = 1173360447. Its totient is φ = 251922048.

The previous prime is 628776719. The next prime is 628776727. The reversal of 628776722 is 227677826.

It can be written as a sum of positive squares in 5 ways, for example, as 227135041 + 401641681 = 15071^2 + 20041^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17731.

It is a super-2 number, since 2×628776722² = 790720332258130568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628776727) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4219904 + ... + 4220052.

Almost surely, 2^628776722 is an apocalyptic number.

628776722 is a deficient number, since it is larger than the sum of its proper divisors (544583725).

628776722 is a wasteful number, since it uses less digits than its factorization.

628776722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 175 counting only the distinct ones).

The product of its digits is 790272, while the sum is 47.

The square root of 628776722 is about 25075.4206744373. The cubic root of 628776722 is about 856.7066770784.

The spelling of 628776722 in words is "six hundred twenty-eight million, seven hundred seventy-six thousand, seven hundred twenty-two".