65855990 has 16 divisors (see below), whose sum is σ = 118633248. Its totient is φ = 26321856.

The previous prime is 65855987. The next prime is 65856017. The reversal of 65855990 is 9955856.

It is a super-2 number, since 2×65855990² = 8674022837760200, which contains 22 as substring.

It is a Curzon 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 in 7 ways as a sum of consecutive naturals, for example, 23399 + ... + 26061.

It is an arithmetic number, because the mean of its divisors is an integer number (7414578).

Almost surely, 2^65855990 is an apocalyptic number.

65855990 is a deficient number, since it is larger than the sum of its proper divisors (52777258).

65855990 is a wasteful number, since it uses less digits than its factorization.

65855990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143.

The product of its (nonzero) digits is 486000, while the sum is 47.

The square root of 65855990 is about 8115.1703617361. The cubic root of 65855990 is about 403.8298592460.

The spelling of 65855990 in words is "sixty-five million, eight hundred fifty-five thousand, nine hundred ninety".