78211979760 has 40 divisors (see below), whose sum is σ = 242457138000. Its totient is φ = 20856527872.

The previous prime is 78211979749. The next prime is 78211979761. The reversal of 78211979760 is 6797911287.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×78211979760² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78211979760.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78211979761) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 162941385 + ... + 162941864.

It is an arithmetic number, because the mean of its divisors is an integer number (6061428450).

Almost surely, 2^78211979760 is an apocalyptic number.

It is an amenable number.

78211979760 is an abundant number, since it is smaller than the sum of its proper divisors (164245158240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78211979760 is a wasteful number, since it uses less digits than its factorization.

78211979760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325883265 (or 325883259 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 57.

The spelling of 78211979760 in words is "seventy-eight billion, two hundred eleven million, nine hundred seventy-nine thousand, seven hundred sixty".