65651040 has 384 divisors, whose sum is σ = 284497920. Its totient is φ = 13768704.

The previous prime is 65650979. The next prime is 65651063. The reversal of 65651040 is 4015656.

It is a happy number.

65651040 is a `hidden beast` number, since 6 + 5 + 651 + 0 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 65650995 and 65651013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 393037 + ... + 393203.

It is an arithmetic number, because the mean of its divisors is an integer number (740880).

Almost surely, 2^65651040 is an apocalyptic number.

65651040 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 65651040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142248960).

65651040 is an abundant number, since it is smaller than the sum of its proper divisors (218846880).

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

65651040 is a wasteful number, since it uses less digits than its factorization.

65651040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 65651040 is about 8102.5329372981. The cubic root of 65651040 is about 403.4105051584.

Adding to 65651040 its reverse (4015656), we get a palindrome (69666696).

The spelling of 65651040 in words is "sixty-five million, six hundred fifty-one thousand, forty".