865650240 has 560 divisors, whose sum is σ = 3800197632. Its totient is φ = 182145024.

The previous prime is 865650239. The next prime is 865650257. The reversal of 865650240 is 42056568.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 865650195 and 865650204.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2358537 + ... + 2358903.

Almost surely, 2^865650240 is an apocalyptic number.

865650240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865650240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1900098816).

865650240 is an abundant number, since it is smaller than the sum of its proper divisors (2934547392).

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

865650240 is a wasteful number, since it uses less digits than its factorization.

865650240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 865650240 is about 29421.9346746607. The cubic root of 865650240 is about 953.0466327254.

The spelling of 865650240 in words is "eight hundred sixty-five million, six hundred fifty thousand, two hundred forty".