65701978 has 4 divisors (see below), whose sum is σ = 98552970. Its totient is φ = 32850988.

The previous prime is 65701969. The next prime is 65702003. The reversal of 65701978 is 87910756.

65701978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 64529089 + 1172889 = 8033^2 + 1083^2 .

It is a super-2 number, since 2×65701978² = 8633499826224968, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16425493 + ... + 16425496.

Almost surely, 2^65701978 is an apocalyptic number.

65701978 is a deficient number, since it is larger than the sum of its proper divisors (32850992).

65701978 is a wasteful number, since it uses less digits than its factorization.

65701978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32850991.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 65701978 is about 8105.6756658529. The cubic root of 65701978 is about 403.5148122749.

The spelling of 65701978 in words is "sixty-five million, seven hundred one thousand, nine hundred seventy-eight".