653978330 has 16 divisors (see below), whose sum is σ = 1208976840. Its totient is φ = 254521152.

The previous prime is 653978317. The next prime is 653978341. The reversal of 653978330 is 33879356.

It is a Cunningham number, because it is equal to 25573²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 585204481 + 68773849 = 24191^2 + 8293^2 .

It is a super-2 number, since 2×653978330² = 855375312219177800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 883385 + ... + 884124.

Almost surely, 2^653978330 is an apocalyptic number.

653978330 is a deficient number, since it is larger than the sum of its proper divisors (554998510).

653978330 is a wasteful number, since it uses less digits than its factorization.

653978330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767553.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 653978330 is about 25573.0000195519. Note that the first 4 decimals coincide. The cubic root of 653978330 is about 868.0027863814.

The spelling of 653978330 in words is "six hundred fifty-three million, nine hundred seventy-eight thousand, three hundred thirty".