65972978 has 8 divisors (see below), whose sum is σ = 104167920. Its totient is φ = 31250340.

The previous prime is 65972911. The next prime is 65972981. The reversal of 65972978 is 87927956.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868028 + ... + 868103.

It is an arithmetic number, because the mean of its divisors is an integer number (13020990).

Almost surely, 2^65972978 is an apocalyptic number.

65972978 is a deficient number, since it is larger than the sum of its proper divisors (38194942).

65972978 is a wasteful number, since it uses less digits than its factorization.

65972978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736152.

The product of its digits is 1905120, while the sum is 53.

The square root of 65972978 is about 8122.3751452392. The cubic root of 65972978 is about 404.0688418124.

It can be divided in two parts, 659 and 72978, that added together give a palindrome (73637).

The spelling of 65972978 in words is "sixty-five million, nine hundred seventy-two thousand, nine hundred seventy-eight".