78396455 has 4 divisors (see below), whose sum is σ = 94075752. Its totient is φ = 62717160.

The previous prime is 78396449. The next prime is 78396457. The reversal of 78396455 is 55469387.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78396455 - 2⁶ = 78396391 is a prime.

It is a super-2 number, since 2×78396455² = 12292008313134050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78396457) 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 3 ways as a sum of consecutive naturals, for example, 7839641 + ... + 7839650.

It is an arithmetic number, because the mean of its divisors is an integer number (23518938).

Almost surely, 2^78396455 is an apocalyptic number.

78396455 is a deficient number, since it is larger than the sum of its proper divisors (15679297).

78396455 is a wasteful number, since it uses less digits than its factorization.

78396455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15679296.

The product of its digits is 907200, while the sum is 47.

The square root of 78396455 is about 8854.1772627388. The cubic root of 78396455 is about 427.9885412689.

The spelling of 78396455 in words is "seventy-eight million, three hundred ninety-six thousand, four hundred fifty-five".