78247434 has 32 divisors (see below), whose sum is σ = 168759360. Its totient is φ = 24105600.

The previous prime is 78247399. The next prime is 78247483. The reversal of 78247434 is 43474287.

It is a super-2 number, since 2×78247434² = 12245321855168712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 78247392 and 78247401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3697 + ... + 13044.

It is an arithmetic number, because the mean of its divisors is an integer number (5273730).

Almost surely, 2^78247434 is an apocalyptic number.

78247434 is an abundant number, since it is smaller than the sum of its proper divisors (90511926).

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

78247434 is a wasteful number, since it uses less digits than its factorization.

78247434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16806.

The product of its digits is 150528, while the sum is 39.

The square root of 78247434 is about 8845.7579663927. The cubic root of 78247434 is about 427.7171865882.

The spelling of 78247434 in words is "seventy-eight million, two hundred forty-seven thousand, four hundred thirty-four".