65633690 has 16 divisors (see below), whose sum is σ = 118660680. Its totient is φ = 26137920.

The previous prime is 65633653. The next prime is 65633713. The reversal of 65633690 is 9633656.

It can be written as a sum of positive squares in 4 ways, for example, as 64529089 + 1104601 = 8033^2 + 1051^2 .

It is a super-2 number, since 2×65633690² = 8615562526032200, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 12041 + ... + 16620.

Almost surely, 2^65633690 is an apocalyptic number.

65633690 is a deficient number, since it is larger than the sum of its proper divisors (53026990).

65633690 is a wasteful number, since it uses less digits than its factorization.

65633690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28897.

The product of its (nonzero) digits is 87480, while the sum is 38.

The square root of 65633690 is about 8101.4622136995. The cubic root of 65633690 is about 403.3749647774.

The spelling of 65633690 in words is "sixty-five million, six hundred thirty-three thousand, six hundred ninety".