65978416 has 60 divisors (see below), whose sum is σ = 151206096. Its totient is φ = 27319680.

The previous prime is 65978413. The next prime is 65978441. The reversal of 65978416 is 61487956.

It is not an unprimeable number, because it can be changed into a prime (65978413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107326 + ... + 107938.

Almost surely, 2^65978416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65978416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75603048).

65978416 is an abundant number, since it is smaller than the sum of its proper divisors (85227680).

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

65978416 is a wasteful number, since it uses less digits than its factorization.

65978416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 653 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 65978416 is about 8122.7098926405. The cubic root of 65978416 is about 404.0799436608.

The spelling of 65978416 in words is "sixty-five million, nine hundred seventy-eight thousand, four hundred sixteen".