78421379 has 8 divisors (see below), whose sum is σ = 84469440. Its totient is φ = 72565416.

The previous prime is 78421373. The next prime is 78421381. The reversal of 78421379 is 97312487.

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 78421379 - 2¹⁶ = 78355843 is a prime.

It is a super-2 number, since 2×78421379² = 12299825368523282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78421373) 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 in 7 ways as a sum of consecutive naturals, for example, 47177 + ... + 48810.

It is an arithmetic number, because the mean of its divisors is an integer number (10558680).

Almost surely, 2^78421379 is an apocalyptic number.

78421379 is a deficient number, since it is larger than the sum of its proper divisors (6048061).

78421379 is a wasteful number, since it uses less digits than its factorization.

78421379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96049.

The product of its digits is 84672, while the sum is 41.

The square root of 78421379 is about 8855.5846221466. The cubic root of 78421379 is about 428.0338921977.

The spelling of 78421379 in words is "seventy-eight million, four hundred twenty-one thousand, three hundred seventy-nine".