65978319 has 8 divisors (see below), whose sum is σ = 95968512. Its totient is φ = 39986840.

The previous prime is 65978303. The next prime is 65978347. The reversal of 65978319 is 91387956.

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 65978319 - 2⁴ = 65978303 is a prime.

It is a super-2 number, since 2×65978319² = 8706277156131522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65978369) 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, 999639 + ... + 999704.

It is an arithmetic number, because the mean of its divisors is an integer number (11996064).

Almost surely, 2^65978319 is an apocalyptic number.

65978319 is a deficient number, since it is larger than the sum of its proper divisors (29990193).

65978319 is a wasteful number, since it uses less digits than its factorization.

65978319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999357.

The product of its digits is 408240, while the sum is 48.

The square root of 65978319 is about 8122.7039217246. The cubic root of 65978319 is about 404.0797456376.

The spelling of 65978319 in words is "sixty-five million, nine hundred seventy-eight thousand, three hundred nineteen".