78380401 has 8 divisors (see below), whose sum is σ = 85680000. Its totient is φ = 71109840.

The previous prime is 78380399. The next prime is 78380429. The reversal of 78380401 is 10408387.

It is a happy number.

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 78380401 - 2¹ = 78380399 is a prime.

It is a super-2 number, since 2×78380401² = 12286974521841602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78380101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1401 + ... + 12598.

It is an arithmetic number, because the mean of its divisors is an integer number (10710000).

Almost surely, 2^78380401 is an apocalyptic number.

It is an amenable number.

78380401 is a deficient number, since it is larger than the sum of its proper divisors (7299599).

78380401 is a wasteful number, since it uses less digits than its factorization.

78380401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14519.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 78380401 is about 8853.2706385832. The cubic root of 78380401 is about 427.9593248241.

Adding to 78380401 its reverse (10408387), we get a palindrome (88788788).

The spelling of 78380401 in words is "seventy-eight million, three hundred eighty thousand, four hundred one".