628689949 has 8 divisors (see below), whose sum is σ = 635089248. Its totient is φ = 622300560.

The previous prime is 628689923. The next prime is 628689961. The reversal of 628689949 is 949986826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628689949 - 2¹⁹ = 628165661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628689989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256759 + ... + 259195.

It is an arithmetic number, because the mean of its divisors is an integer number (79386156).

Almost surely, 2^628689949 is an apocalyptic number.

It is an amenable number.

628689949 is a deficient number, since it is larger than the sum of its proper divisors (6399299).

628689949 is a wasteful number, since it uses less digits than its factorization.

628689949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955.

The product of its digits is 13436928, while the sum is 61.

The square root of 628689949 is about 25073.6903745739. The cubic root of 628689949 is about 856.6672659351.

The spelling of 628689949 in words is "six hundred twenty-eight million, six hundred eighty-nine thousand, nine hundred forty-nine".