78402187424 has 48 divisors (see below), whose sum is σ = 168698176416. Its totient is φ = 35571398400.

The previous prime is 78402187403. The next prime is 78402187439. The reversal of 78402187424 is 42478120487.

It is a super-2 number, since 2×78402187424² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15422 + ... + 396285.

It is an arithmetic number, because the mean of its divisors is an integer number (3514545342).

Almost surely, 2^78402187424 is an apocalyptic number.

It is an amenable number.

78402187424 is an abundant number, since it is smaller than the sum of its proper divisors (90295988992).

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

78402187424 is a wasteful number, since it uses less digits than its factorization.

78402187424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412269 (or 412261 counting only the distinct ones).

The product of its (nonzero) digits is 802816, while the sum is 47.

The spelling of 78402187424 in words is "seventy-eight billion, four hundred two million, one hundred eighty-seven thousand, four hundred twenty-four".