65437040 has 40 divisors (see below), whose sum is σ = 152534880. Its totient is φ = 26107136.

The previous prime is 65437039. The next prime is 65437049. The reversal of 65437040 is 4073456.

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

It is a junction number, because it is equal to n+sod(n) for n = 65436994 and 65437012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65437049) 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, 39917 + ... + 41523.

It is an arithmetic number, because the mean of its divisors is an integer number (3813372).

Almost surely, 2^65437040 is an apocalyptic number.

It is an amenable number.

65437040 is an abundant number, since it is smaller than the sum of its proper divisors (87097840).

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

65437040 is a wasteful number, since it uses less digits than its factorization.

65437040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129 (or 2123 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 65437040 is about 8089.3164111685. The cubic root of 65437040 is about 402.9717011410.

The spelling of 65437040 in words is "sixty-five million, four hundred thirty-seven thousand, forty".