78266608740 has 36 divisors (see below), whose sum is σ = 237408713724. Its totient is φ = 20871095616.

The previous prime is 78266608709. The next prime is 78266608747. The reversal of 78266608740 is 4780666287.

It can be written as a sum of positive squares in 2 ways, for example, as 31475727396 + 46790881344 = 177414^2 + 216312^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×78266608740³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (78266608747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217407067 + ... + 217407426.

Almost surely, 2^78266608740 is an apocalyptic number.

It is an amenable number.

78266608740 is an abundant number, since it is smaller than the sum of its proper divisors (159142104984).

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

78266608740 is a wasteful number, since it uses less digits than its factorization.

78266608740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434814508 (or 434814503 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 78266608740 in words is "seventy-eight billion, two hundred sixty-six million, six hundred eight thousand, seven hundred forty".