653990998 has 4 divisors (see below), whose sum is σ = 980986500. Its totient is φ = 326995498.

The previous prime is 653990929. The next prime is 653991007. The reversal of 653990998 is 899099356.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 163497748 + ... + 163497751.

It is an arithmetic number, because the mean of its divisors is an integer number (245246625).

Almost surely, 2^653990998 is an apocalyptic number.

653990998 is a deficient number, since it is larger than the sum of its proper divisors (326995502).

653990998 is a wasteful number, since it uses less digits than its factorization.

653990998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326995501.

The product of its (nonzero) digits is 4723920, while the sum is 58.

The square root of 653990998 is about 25573.2477014555. The cubic root of 653990998 is about 868.0083909444.

The spelling of 653990998 in words is "six hundred fifty-three million, nine hundred ninety thousand, nine hundred ninety-eight".