65780040 has 64 divisors (see below), whose sum is σ = 197976960. Its totient is φ = 17484800.

The previous prime is 65780027. The next prime is 65780053. The reversal of 65780040 is 4008756.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65780027) and next prime (65780053).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47437 + ... + 48803.

It is an arithmetic number, because the mean of its divisors is an integer number (3093390).

Almost surely, 2^65780040 is an apocalyptic number.

65780040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65780040 is an abundant number, since it is smaller than the sum of its proper divisors (132196920).

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

65780040 is a wasteful number, since it uses less digits than its factorization.

65780040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 65780040 is about 8110.4895043394. The cubic root of 65780040 is about 403.6745573719.

Adding to 65780040 its reverse (4008756), we get a palindrome (69788796).

The spelling of 65780040 in words is "sixty-five million, seven hundred eighty thousand, forty".