628257749 has 16 divisors (see below), whose sum is σ = 742726656. Its totient is φ = 520041600.

The previous prime is 628257737. The next prime is 628257787. The reversal of 628257749 is 947752826.

It is a cyclic number.

It is not a de Polignac number, because 628257749 - 2⁴ = 628257733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 628257697 and 628257706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628256749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110279 + ... + 115835.

It is an arithmetic number, because the mean of its divisors is an integer number (46420416).

Almost surely, 2^628257749 is an apocalyptic number.

It is an amenable number.

628257749 is a deficient number, since it is larger than the sum of its proper divisors (114468907).

628257749 is a wasteful number, since it uses less digits than its factorization.

628257749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6116.

The product of its digits is 1693440, while the sum is 50.

The square root of 628257749 is about 25065.0702971286. The cubic root of 628257749 is about 856.4709124067.

The spelling of 628257749 in words is "six hundred twenty-eight million, two hundred fifty-seven thousand, seven hundred forty-nine".