78139011 has 8 divisors (see below), whose sum is σ = 104981184. Its totient is φ = 51694760.

The previous prime is 78138959. The next prime is 78139037. The reversal of 78139011 is 11093187.

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

It is a cyclic number.

It is not a de Polignac number, because 78139011 - 2⁶ = 78138947 is a prime.

It is a super-2 number, since 2×78139011² = 12211410080116242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78139011.

It is not an unprimeable number, because it can be changed into a prime (78139091) by changing a digit.

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, 99021 + ... + 99806.

It is an arithmetic number, because the mean of its divisors is an integer number (13122648).

Almost surely, 2^78139011 is an apocalyptic number.

78139011 is a deficient number, since it is larger than the sum of its proper divisors (26842173).

78139011 is a wasteful number, since it uses less digits than its factorization.

78139011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198961.

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 78139011 is about 8839.6273111484. The cubic root of 78139011 is about 427.5195408461.

The spelling of 78139011 in words is "seventy-eight million, one hundred thirty-nine thousand, eleven".