78097078 has 4 divisors (see below), whose sum is σ = 117145620. Its totient is φ = 39048538.

The previous prime is 78097069. The next prime is 78097081. The reversal of 78097078 is 87079087.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19524268 + ... + 19524271.

It is an arithmetic number, because the mean of its divisors is an integer number (29286405).

Almost surely, 2^78097078 is an apocalyptic number.

78097078 is a deficient number, since it is larger than the sum of its proper divisors (39048542).

78097078 is a wasteful number, since it uses less digits than its factorization.

78097078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39048541.

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 78097078 is about 8837.2551168335. The cubic root of 78097078 is about 427.4430515890.

Subtracting 78097078 from its reverse (87079087), we obtain a square (8982009 = 2997²).

The spelling of 78097078 in words is "seventy-eight million, ninety-seven thousand, seventy-eight".