78408393 has 32 divisors (see below), whose sum is σ = 126246912. Its totient is φ = 42336000.

The previous prime is 78408391. The next prime is 78408397. The reversal of 78408393 is 39380487.

It is not a de Polignac number, because 78408393 - 2¹ = 78408391 is a prime.

It is a super-2 number, since 2×78408393² = 12295752185684898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78408391) 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 31 ways as a sum of consecutive naturals, for example, 26593 + ... + 29393.

It is an arithmetic number, because the mean of its divisors is an integer number (3945216).

Almost surely, 2^78408393 is an apocalyptic number.

It is an amenable number.

78408393 is a deficient number, since it is larger than the sum of its proper divisors (47838519).

78408393 is a wasteful number, since it uses less digits than its factorization.

78408393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 78408393 is about 8854.8513821520. The cubic root of 78408393 is about 428.0102644786.

The spelling of 78408393 in words is "seventy-eight million, four hundred eight thousand, three hundred ninety-three".