65978983 has 8 divisors (see below), whose sum is σ = 76359680. Its totient is φ = 55837080.

The previous prime is 65978981. The next prime is 65978999. The reversal of 65978983 is 38987956.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65978983 - 2¹ = 65978981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65978981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59103 + ... + 60208.

It is an arithmetic number, because the mean of its divisors is an integer number (9544960).

Almost surely, 2^65978983 is an apocalyptic number.

65978983 is a deficient number, since it is larger than the sum of its proper divisors (10380697).

65978983 is a wasteful number, since it uses less digits than its factorization.

65978983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119397.

The product of its digits is 3265920, while the sum is 55.

The square root of 65978983 is about 8122.7447947107. The cubic root of 65978983 is about 404.0811011740.

The spelling of 65978983 in words is "sixty-five million, nine hundred seventy-eight thousand, nine hundred eighty-three".