628664949 has 16 divisors (see below), whose sum is σ = 1016024640. Its totient is φ = 381008880.

The previous prime is 628664921. The next prime is 628664999. The reversal of 628664949 is 949466826.

628664949 is a `hidden beast` number, since 628 + 6 + 6 + 4 + 9 + 4 + 9 = 666.

It is not a de Polignac number, because 628664949 - 2⁷ = 628664821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 628664895 and 628664904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628664999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058062 + ... + 1058655.

It is an arithmetic number, because the mean of its divisors is an integer number (63501540).

Almost surely, 2^628664949 is an apocalyptic number.

It is an amenable number.

628664949 is a deficient number, since it is larger than the sum of its proper divisors (387359691).

628664949 is a wasteful number, since it uses less digits than its factorization.

628664949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116737 (or 2116731 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 628664949 is about 25073.1918390938. The cubic root of 628664949 is about 856.6559105945.

The spelling of 628664949 in words is "six hundred twenty-eight million, six hundred sixty-four thousand, nine hundred forty-nine".