628354489 has 9 divisors (see below), whose sum is σ = 731147151. Its totient is φ = 538439160.

The previous prime is 628354439. The next prime is 628354499. The reversal of 628354489 is 984453826.

The square root of 628354489 is 25067.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 560126889 + 68227600 = 23667^2 + 8260^2 .

It is not a de Polignac number, because 628354489 - 2⁹ = 628353977 is a prime.

It is a super-2 number, since 2×628354489² = 789658727692902242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (628354409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 173679 + ... + 177259.

Almost surely, 2^628354489 is an apocalyptic number.

628354489 is the 25067-th square number.

628354489 is the 12534-th centered octagonal number.

It is an amenable number.

628354489 is a deficient number, since it is larger than the sum of its proper divisors (102792662).

628354489 is an frugal number, since it uses more digits than its factorization.

628354489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7176 (or 3588 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The cubic root of 628354489 is about 856.5148703438.

Multiplying 628354489 by its sum of digits (49), we get a square (30789369961 = 175469²).

628354489 divided by its sum of digits (49) gives a square (12823561 = 3581²).

The spelling of 628354489 in words is "six hundred twenty-eight million, three hundred fifty-four thousand, four hundred eighty-nine".