65920040 has 16 divisors (see below), whose sum is σ = 148320180. Its totient is φ = 26368000.

The previous prime is 65920031. The next prime is 65920091. The reversal of 65920040 is 4002956.

It can be written as a sum of positive squares in 2 ways, for example, as 60435076 + 5484964 = 7774^2 + 2342^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65919991 and 65920009.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823961 + ... + 824040.

Almost surely, 2^65920040 is an apocalyptic number.

It is an amenable number.

65920040 is an abundant number, since it is smaller than the sum of its proper divisors (82400140).

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

65920040 is a wasteful number, since it uses less digits than its factorization.

65920040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648012 (or 1648008 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 65920040 is about 8119.1157153966. The cubic root of 65920040 is about 403.9607353272.

Adding to 65920040 its reverse (4002956), we get a palindrome (69922996).

The spelling of 65920040 in words is "sixty-five million, nine hundred twenty thousand, forty".