78220895 has 4 divisors (see below), whose sum is σ = 93865080. Its totient is φ = 62576712.

The previous prime is 78220873. The next prime is 78220903. The reversal of 78220895 is 59802287.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78220895 is a prime.

It is a super-2 number, since 2×78220895² = 12237016829202050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7822085 + ... + 7822094.

It is an arithmetic number, because the mean of its divisors is an integer number (23466270).

Almost surely, 2^78220895 is an apocalyptic number.

78220895 is a deficient number, since it is larger than the sum of its proper divisors (15644185).

78220895 is a wasteful number, since it uses less digits than its factorization.

78220895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15644184.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 78220895 is about 8844.2577416084. The cubic root of 78220895 is about 427.6688251728.

The spelling of 78220895 in words is "seventy-eight million, two hundred twenty thousand, eight hundred ninety-five".