65785020 has 48 divisors (see below), whose sum is σ = 210513408. Its totient is φ = 15036480.

The previous prime is 65785003. The next prime is 65785063. The reversal of 65785020 is 2058756.

Added to its reverse (2058756) it gives a triangular number (67843776 = T₁₁₆₄₈).

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 77896 + ... + 78735.

It is an arithmetic number, because the mean of its divisors is an integer number (4385696).

Almost surely, 2^65785020 is an apocalyptic number.

65785020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65785020 is an abundant number, since it is smaller than the sum of its proper divisors (144728388).

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

65785020 is a wasteful number, since it uses less digits than its factorization.

65785020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156650 (or 156648 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 65785020 is about 8110.7965083585. The cubic root of 65785020 is about 403.6847440920.

Adding to 65785020 its reverse (2058756), we get a triangular number (67843776 = T₁₁₆₄₈).

The spelling of 65785020 in words is "sixty-five million, seven hundred eighty-five thousand, twenty".