78008381 has 4 divisors (see below), whose sum is σ = 85100064. Its totient is φ = 70916700.

The previous prime is 78008351. The next prime is 78008383. The reversal of 78008381 is 18380087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78008381 - 2¹⁴ = 77991997 is a prime.

It is a super-2 number, since 2×78008381² = 12170615012482322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78008383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545825 + ... + 3545846.

It is an arithmetic number, because the mean of its divisors is an integer number (21275016).

Almost surely, 2^78008381 is an apocalyptic number.

It is an amenable number.

78008381 is a deficient number, since it is larger than the sum of its proper divisors (7091683).

78008381 is a wasteful number, since it uses less digits than its factorization.

78008381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091682.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 78008381 is about 8832.2353342741. The cubic root of 78008381 is about 427.2811706783.

The spelling of 78008381 in words is "seventy-eight million, eight thousand, three hundred eighty-one".