65474640 has 240 divisors, whose sum is σ = 274375296. Its totient is φ = 13593600.

The previous prime is 65474593. The next prime is 65474641. The reversal of 65474640 is 4647456.

65474640 is a `hidden beast` number, since 6 + 5 + 4 + 7 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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 = 65474595 and 65474604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65474641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54850 + ... + 56030.

Almost surely, 2^65474640 is an apocalyptic number.

65474640 is a gapful number since it is divisible by the number (60) 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 65474640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137187648).

65474640 is an abundant number, since it is smaller than the sum of its proper divisors (208900656).

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

65474640 is a wasteful number, since it uses less digits than its factorization.

65474640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 65474640 is about 8091.6401304062. The cubic root of 65474640 is about 403.0488686231.

The spelling of 65474640 in words is "sixty-five million, four hundred seventy-four thousand, six hundred forty".