65445978 has 16 divisors (see below), whose sum is σ = 140960736. Its totient is φ = 20137200.

The previous prime is 65445973. The next prime is 65445979. The reversal of 65445978 is 87954456.

65445978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (65445973) 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 7 ways as a sum of consecutive naturals, for example, 419448 + ... + 419603.

It is an arithmetic number, because the mean of its divisors is an integer number (8810046).

Almost surely, 2^65445978 is an apocalyptic number.

65445978 is an abundant number, since it is smaller than the sum of its proper divisors (75514758).

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

65445978 is a wasteful number, since it uses less digits than its factorization.

65445978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839069.

The product of its digits is 1209600, while the sum is 48.

The square root of 65445978 is about 8089.8688493696. The cubic root of 65445978 is about 402.9900475143.

The spelling of 65445978 in words is "sixty-five million, four hundred forty-five thousand, nine hundred seventy-eight".