78385520424 has 32 divisors (see below), whose sum is σ = 196003224000. Its totient is φ = 26123250432.

The previous prime is 78385520419. The next prime is 78385520429. The reversal of 78385520424 is 42402558387.

It is an interprime number because it is at equal distance from previous prime (78385520419) and next prime (78385520429).

It is a super-2 number, since 2×78385520424² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78385520429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205804 + ... + 446235.

It is an arithmetic number, because the mean of its divisors is an integer number (6125100750).

Almost surely, 2^78385520424 is an apocalyptic number.

It is an amenable number.

78385520424 is an abundant number, since it is smaller than the sum of its proper divisors (117617703576).

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

78385520424 is a wasteful number, since it uses less digits than its factorization.

78385520424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657057 (or 657053 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 48.

The spelling of 78385520424 in words is "seventy-eight billion, three hundred eighty-five million, five hundred twenty thousand, four hundred twenty-four".