78324881 has 4 divisors (see below), whose sum is σ = 79132452. Its totient is φ = 77517312.

The previous prime is 78324877. The next prime is 78324929. The reversal of 78324881 is 18842387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48720400 + 29604481 = 6980^2 + 5441^2 .

It is a cyclic number.

It is not a de Polignac number, because 78324881 - 2² = 78324877 is a prime.

It is a super-2 number, since 2×78324881² = 12269573967328322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78324871) 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 3 ways as a sum of consecutive naturals, for example, 403640 + ... + 403833.

It is an arithmetic number, because the mean of its divisors is an integer number (19783113).

Almost surely, 2^78324881 is an apocalyptic number.

It is an amenable number.

78324881 is a deficient number, since it is larger than the sum of its proper divisors (807571).

78324881 is an equidigital number, since it uses as much as digits as its factorization.

78324881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807570.

The product of its digits is 86016, while the sum is 41.

The square root of 78324881 is about 8850.1345187517. The cubic root of 78324881 is about 427.8582540047.

The spelling of 78324881 in words is "seventy-eight million, three hundred twenty-four thousand, eight hundred eighty-one".