78159842 has 16 divisors (see below), whose sum is σ = 124649280. Its totient is φ = 36674352.

The previous prime is 78159827. The next prime is 78159847. The reversal of 78159842 is 24895187.

It is a super-2 number, since 2×78159842² = 12217921802929928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78159793 and 78159802.

It is not an unprimeable number, because it can be changed into a prime (78159847) 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, 13592 + ... + 18467.

It is an arithmetic number, because the mean of its divisors is an integer number (7790580).

Almost surely, 2^78159842 is an apocalyptic number.

78159842 is a deficient number, since it is larger than the sum of its proper divisors (46489438).

78159842 is a wasteful number, since it uses less digits than its factorization.

78159842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32137.

The product of its digits is 161280, while the sum is 44.

The square root of 78159842 is about 8840.8055062873. The cubic root of 78159842 is about 427.5575281381.

The spelling of 78159842 in words is "seventy-eight million, one hundred fifty-nine thousand, eight hundred forty-two".