65514640 has 40 divisors (see below), whose sum is σ = 152688888. Its totient is φ = 26142720.

The previous prime is 65514637. The next prime is 65514643. The reversal of 65514640 is 4641556.

It is an interprime number because it is at equal distance from previous prime (65514637) and next prime (65514643).

It can be written as a sum of positive squares in 4 ways, for example, as 7997584 + 57517056 = 2828^2 + 7584^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (65514643) 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, 46750 + ... + 48130.

Almost surely, 2^65514640 is an apocalyptic number.

It is an amenable number.

65514640 is an abundant number, since it is smaller than the sum of its proper divisors (87174248).

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

65514640 is a wasteful number, since it uses less digits than its factorization.

65514640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987 (or 1981 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 65514640 is about 8094.1114398061. Note that the first 3 decimals coincide. The cubic root of 65514640 is about 403.1309292640.

The spelling of 65514640 in words is "sixty-five million, five hundred fourteen thousand, six hundred forty".