78149395 has 8 divisors (see below), whose sum is σ = 93848400. Its totient is φ = 62473440.

The previous prime is 78149389. The next prime is 78149399. The reversal of 78149395 is 59394187.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78149395 - 2⁵ = 78149363 is a prime.

It is a super-2 number, since 2×78149395² = 12214655877732050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78149399) 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, 2881 + ... + 12829.

It is an arithmetic number, because the mean of its divisors is an integer number (11731050).

Almost surely, 2^78149395 is an apocalyptic number.

78149395 is a deficient number, since it is larger than the sum of its proper divisors (15699005).

78149395 is a wasteful number, since it uses less digits than its factorization.

78149395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11525.

The product of its digits is 272160, while the sum is 46.

The square root of 78149395 is about 8840.2146467153. The cubic root of 78149395 is about 427.5384778927.

It can be divided in two parts, 781 and 49395, that added together give a square (50176 = 224²).

The spelling of 78149395 in words is "seventy-eight million, one hundred forty-nine thousand, three hundred ninety-five".