65681478 has 24 divisors (see below), whose sum is σ = 142602408. Its totient is φ = 21848832.

The previous prime is 65681477. The next prime is 65681503. The reversal of 65681478 is 87418656.

It is a happy number.

65681478 is a `hidden beast` number, since 6 + 568 + 14 + 78 = 666.

65681478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×65681478⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65681477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5926 + ... + 12902.

It is an arithmetic number, because the mean of its divisors is an integer number (5941767).

Almost surely, 2^65681478 is an apocalyptic number.

65681478 is an abundant number, since it is smaller than the sum of its proper divisors (76920930).

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

65681478 is a wasteful number, since it uses less digits than its factorization.

65681478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7508 (or 7505 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 65681478 is about 8104.4110211662. The cubic root of 65681478 is about 403.4728403567.

The spelling of 65681478 in words is "sixty-five million, six hundred eighty-one thousand, four hundred seventy-eight".