78419816 has 8 divisors (see below), whose sum is σ = 147037170. Its totient is φ = 39209904.

The previous prime is 78419813. The next prime is 78419837. The reversal of 78419816 is 61891487.

It can be written as a sum of positive squares in only one way, i.e., 78251716 + 168100 = 8846^2 + 410^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78419816² = 12299335082947712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78419813) by changing a digit.

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 as a sum of consecutive naturals, namely, 4901231 + ... + 4901246.

Almost surely, 2^78419816 is an apocalyptic number.

It is an amenable number.

78419816 is a deficient number, since it is larger than the sum of its proper divisors (68617354).

78419816 is a wasteful number, since it uses less digits than its factorization.

78419816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9802483 (or 9802479 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The square root of 78419816 is about 8855.4963723103. The cubic root of 78419816 is about 428.0310484944.

The spelling of 78419816 in words is "seventy-eight million, four hundred nineteen thousand, eight hundred sixteen".