64865140 has 24 divisors (see below), whose sum is σ = 136621800. Its totient is φ = 25868928.

The previous prime is 64865093. The next prime is 64865147. The reversal of 64865140 is 4156846.

It can be written as a sum of positive squares in 4 ways, for example, as 2328676 + 62536464 = 1526^2 + 7908^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64865096 and 64865105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64865147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2334 + ... + 11626.

It is an arithmetic number, because the mean of its divisors is an integer number (5692575).

Almost surely, 2^64865140 is an apocalyptic number.

It is an amenable number.

64865140 is an abundant number, since it is smaller than the sum of its proper divisors (71756660).

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

64865140 is a wasteful number, since it uses less digits than its factorization.

64865140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9651 (or 9649 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 64865140 is about 8053.8897434718. The cubic root of 64865140 is about 401.7943140574.

The spelling of 64865140 in words is "sixty-four million, eight hundred sixty-five thousand, one hundred forty".