78409364 has 24 divisors (see below), whose sum is σ = 153739488. Its totient is φ = 34676640.

The previous prime is 78409361. The next prime is 78409379. The reversal of 78409364 is 46390487.

It is a super-2 number, since 2×78409364² = 12296056725768992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78409361) 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, 22454 + ... + 25709.

It is an arithmetic number, because the mean of its divisors is an integer number (6405812).

Almost surely, 2^78409364 is an apocalyptic number.

78409364 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

78409364 is a deficient number, since it is larger than the sum of its proper divisors (75330124).

78409364 is a wasteful number, since it uses less digits than its factorization.

78409364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48215 (or 48213 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 78409364 is about 8854.9062106834. The cubic root of 78409364 is about 428.0120312803.

The spelling of 78409364 in words is "seventy-eight million, four hundred nine thousand, three hundred sixty-four".