78065731 has 8 divisors (see below), whose sum is σ = 80195904. Its totient is φ = 75955200.

The previous prime is 78065677. The next prime is 78065761. The reversal of 78065731 is 13756087.

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 78065731 - 2¹¹ = 78063683 is a prime.

It is a super-2 number, since 2×78065731² = 12188516713128722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78065761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3331 + ... + 12931.

It is an arithmetic number, because the mean of its divisors is an integer number (10024488).

Almost surely, 2^78065731 is an apocalyptic number.

78065731 is a deficient number, since it is larger than the sum of its proper divisors (2130173).

78065731 is a wasteful number, since it uses less digits than its factorization.

78065731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9821.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 78065731 is about 8835.4813677581. The cubic root of 78065731 is about 427.3858541846.

The spelling of 78065731 in words is "seventy-eight million, sixty-five thousand, seven hundred thirty-one".