78355011520 has 28 divisors (see below), whose sum is σ = 186582871944. Its totient is φ = 31342004480.

The previous prime is 78355011517. The next prime is 78355011551. The reversal of 78355011520 is 2511055387.

It is a happy number.

It is a super-2 number, since 2×78355011520² (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 78355011520.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 122429386 + ... + 122430025.

It is an arithmetic number, because the mean of its divisors is an integer number (6663673998).

Almost surely, 2^78355011520 is an apocalyptic number.

It is an amenable number.

78355011520 is an abundant number, since it is smaller than the sum of its proper divisors (108227860424).

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

78355011520 is a wasteful number, since it uses less digits than its factorization.

78355011520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244859428 (or 244859418 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 37.

The spelling of 78355011520 in words is "seventy-eight billion, three hundred fifty-five million, eleven thousand, five hundred twenty".