65071778 has 4 divisors (see below), whose sum is σ = 97607670. Its totient is φ = 32535888.

The previous prime is 65071777. The next prime is 65071781. The reversal of 65071778 is 87717056.

65071778 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., 45738169 + 19333609 = 6763^2 + 4397^2 .

It is not an unprimeable number, because it can be changed into a prime (65071777) by changing a digit.

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, 16267943 + ... + 16267946.

Almost surely, 2^65071778 is an apocalyptic number.

65071778 is a deficient number, since it is larger than the sum of its proper divisors (32535892).

65071778 is a wasteful number, since it uses less digits than its factorization.

65071778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32535891.

The product of its (nonzero) digits is 82320, while the sum is 41.

The square root of 65071778 is about 8066.7080026489. The cubic root of 65071778 is about 402.2205212370.

The spelling of 65071778 in words is "sixty-five million, seventy-one thousand, seven hundred seventy-eight".