661028498 has 8 divisors (see below), whose sum is σ = 1067815308. Its totient is φ = 305090064.

The previous prime is 661028497. The next prime is 661028549. The reversal of 661028498 is 894820166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 566297209 + 94731289 = 23797^2 + 9733^2 .

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

It is not an unprimeable number, because it can be changed into a prime (661028497) 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, 12712061 + ... + 12712112.

Almost surely, 2^661028498 is an apocalyptic number.

661028498 is a deficient number, since it is larger than the sum of its proper divisors (406786810).

661028498 is a wasteful number, since it uses less digits than its factorization.

661028498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25424188.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 661028498 is about 25710.4744802580. The cubic root of 661028498 is about 871.1107923793.

The spelling of 661028498 in words is "six hundred sixty-one million, twenty-eight thousand, four hundred ninety-eight".