65921140 has 24 divisors (see below), whose sum is σ = 138960360. Its totient is φ = 26268288.

The previous prime is 65921137. The next prime is 65921179. The reversal of 65921140 is 4112956.

It can be written as a sum of positive squares in 4 ways, for example, as 181476 + 65739664 = 426^2 + 8108^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65921099 and 65921108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747 + ... + 11506.

It is an arithmetic number, because the mean of its divisors is an integer number (5790015).

Almost surely, 2^65921140 is an apocalyptic number.

It is an amenable number.

65921140 is an abundant number, since it is smaller than the sum of its proper divisors (73039220).

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

65921140 is a wasteful number, since it uses less digits than its factorization.

65921140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12531 (or 12529 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 65921140 is about 8119.1834564813. The cubic root of 65921140 is about 403.9629822632.

The spelling of 65921140 in words is "sixty-five million, nine hundred twenty-one thousand, one hundred forty".