65705990 has 64 divisors (see below), whose sum is σ = 143769600. Its totient is φ = 21119616.

The previous prime is 65705987. The next prime is 65705993. The reversal of 65705990 is 9950756.

It is an interprime number because it is at equal distance from previous prime (65705987) and next prime (65705993).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65705993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168716 + ... + 169104.

It is an arithmetic number, because the mean of its divisors is an integer number (2246400).

Almost surely, 2^65705990 is an apocalyptic number.

65705990 is an abundant number, since it is smaller than the sum of its proper divisors (78063610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65705990 is a wasteful number, since it uses less digits than its factorization.

65705990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its (nonzero) digits is 85050, while the sum is 41.

The square root of 65705990 is about 8105.9231429862. The cubic root of 65705990 is about 403.5230254648.

The spelling of 65705990 in words is "sixty-five million, seven hundred five thousand, nine hundred ninety".