65783640 has 64 divisors (see below), whose sum is σ = 212536800. Its totient is φ = 16192512.

The previous prime is 65783621. The next prime is 65783677. The reversal of 65783640 is 4638756.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19525 + ... + 22644.

Almost surely, 2^65783640 is an apocalyptic number.

65783640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65783640 is an abundant number, since it is smaller than the sum of its proper divisors (146753160).

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

65783640 is a wasteful number, since it uses less digits than its factorization.

65783640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42196 (or 42192 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 65783640 is about 8110.7114361195. The cubic root of 65783640 is about 403.6819213174.

The spelling of 65783640 in words is "sixty-five million, seven hundred eighty-three thousand, six hundred forty".