78297355 has 4 divisors (see below), whose sum is σ = 93956832. Its totient is φ = 62637880.

The previous prime is 78297337. The next prime is 78297371. The reversal of 78297355 is 55379287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55379287 = 3989 ⋅13883.

It is not a de Polignac number, because 78297355 - 2⁹ = 78296843 is a prime.

It is a super-2 number, since 2×78297355² = 12260951599992050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7829731 + ... + 7829740.

It is an arithmetic number, because the mean of its divisors is an integer number (23489208).

Almost surely, 2^78297355 is an apocalyptic number.

78297355 is a deficient number, since it is larger than the sum of its proper divisors (15659477).

78297355 is a wasteful number, since it uses less digits than its factorization.

78297355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15659476.

The product of its digits is 529200, while the sum is 46.

The square root of 78297355 is about 8848.5792644921. The cubic root of 78297355 is about 427.8081268674.

The spelling of 78297355 in words is "seventy-eight million, two hundred ninety-seven thousand, three hundred fifty-five".