628961998 has 8 divisors (see below), whose sum is σ = 1078220592. Its totient is φ = 269555136.

The previous prime is 628961969. The next prime is 628961999. The reversal of 628961998 is 899169826.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628961999) 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 3 ways as a sum of consecutive naturals, for example, 22462915 + ... + 22462942.

It is an arithmetic number, because the mean of its divisors is an integer number (134777574).

Almost surely, 2^628961998 is an apocalyptic number.

628961998 is a deficient number, since it is larger than the sum of its proper divisors (449258594).

628961998 is a wasteful number, since it uses less digits than its factorization.

628961998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44925866.

The product of its digits is 3359232, while the sum is 58.

The square root of 628961998 is about 25079.1147770411. The cubic root of 628961998 is about 856.7908148404.

The spelling of 628961998 in words is "six hundred twenty-eight million, nine hundred sixty-one thousand, nine hundred ninety-eight".