78142687420 has 24 divisors (see below), whose sum is σ = 187542450144. Its totient is φ = 26791778496.

The previous prime is 78142687409. The next prime is 78142687457. The reversal of 78142687420 is 2478624187.

It is a super-2 number, since 2×78142687420² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 279080887 + ... + 279081166.

It is an arithmetic number, because the mean of its divisors is an integer number (7814268756).

Almost surely, 2^78142687420 is an apocalyptic number.

78142687420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78142687420 is an abundant number, since it is smaller than the sum of its proper divisors (109399762724).

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

78142687420 is a wasteful number, since it uses less digits than its factorization.

78142687420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558162069 (or 558162067 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 49.

The spelling of 78142687420 in words is "seventy-eight billion, one hundred forty-two million, six hundred eighty-seven thousand, four hundred twenty".