78120426 has 8 divisors (see below), whose sum is σ = 156240864. Its totient is φ = 26040140.

The previous prime is 78120359. The next prime is 78120437. The reversal of 78120426 is 62402187.

It is a sphenic number, since it is the product of 3 distinct primes.

78120426 is an admirable number.

It is a super-2 number, since 2×78120426² = 12205601916842952, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78120393 and 78120402.

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 3 ways as a sum of consecutive naturals, for example, 6510030 + ... + 6510041.

It is an arithmetic number, because the mean of its divisors is an integer number (19530108).

Almost surely, 2^78120426 is an apocalyptic number.

78120426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78120426 is a wasteful number, since it uses less digits than its factorization.

78120426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020076.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 78120426 is about 8838.5760165312. The cubic root of 78120426 is about 427.4856436477.

The spelling of 78120426 in words is "seventy-eight million, one hundred twenty thousand, four hundred twenty-six".