65427840 has 192 divisors, whose sum is σ = 232792560. Its totient is φ = 16920576.

The previous prime is 65427839. The next prime is 65427851. The reversal of 65427840 is 4872456.

65427840 is a `hidden beast` number, since 6 + 542 + 78 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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 = 65427795 and 65427804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212967 + ... + 213273.

Almost surely, 2^65427840 is an apocalyptic number.

65427840 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 65427840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116396280).

65427840 is an abundant number, since it is smaller than the sum of its proper divisors (167364720).

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

65427840 is a wasteful number, since it uses less digits than its factorization.

65427840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 65427840 is about 8088.7477399162. The cubic root of 65427840 is about 402.9528152348.

The spelling of 65427840 in words is "sixty-five million, four hundred twenty-seven thousand, eight hundred forty".