65371978 has 24 divisors (see below), whose sum is σ = 114912000. Its totient is φ = 27809208.

The previous prime is 65371939. The next prime is 65371981. The reversal of 65371978 is 87917356.

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 11 ways as a sum of consecutive naturals, for example, 11223 + ... + 16021.

It is an arithmetic number, because the mean of its divisors is an integer number (4788000).

Almost surely, 2^65371978 is an apocalyptic number.

65371978 is a deficient number, since it is larger than the sum of its proper divisors (49540022).

65371978 is a wasteful number, since it uses less digits than its factorization.

65371978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954 (or 4947 counting only the distinct ones).

The product of its digits is 317520, while the sum is 46.

The square root of 65371978 is about 8085.2939340509. The cubic root of 65371978 is about 402.8381028053.

It can be divided in two parts, 6537 and 1978, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 65371978 in words is "sixty-five million, three hundred seventy-one thousand, nine hundred seventy-eight".