78385883508 has 36 divisors (see below), whose sum is σ = 209797513380. Its totient is φ = 24591649536.

The previous prime is 78385883503. The next prime is 78385883509. The reversal of 78385883508 is 80538858387.

78385883508 is a `hidden beast` number, since 78 + 3 + 8 + 58 + 8 + 3 + 508 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63283439844 + 15102443664 = 251562^2 + 122892^2 .

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

It is a super-2 number, since 2×78385883508² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78385883501) 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, 64040143 + ... + 64041366.

It is an arithmetic number, because the mean of its divisors is an integer number (5827708705).

Almost surely, 2^78385883508 is an apocalyptic number.

It is an amenable number.

78385883508 is an abundant number, since it is smaller than the sum of its proper divisors (131411629872).

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

78385883508 is a wasteful number, since it uses less digits than its factorization.

78385883508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128081536 (or 128081531 counting only the distinct ones).

The product of its (nonzero) digits is 51609600, while the sum is 63.

The spelling of 78385883508 in words is "seventy-eight billion, three hundred eighty-five million, eight hundred eighty-three thousand, five hundred eight".