78905078 has 8 divisors (see below), whose sum is σ = 135265872. Its totient is φ = 33816456.

The previous prime is 78905077. The next prime is 78905089. The reversal of 78905078 is 87050987.

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

It is a super-2 number, since 2×78905078² = 12452022668372168, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78905077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2818025 + ... + 2818052.

It is an arithmetic number, because the mean of its divisors is an integer number (16908234).

Almost surely, 2^78905078 is an apocalyptic number.

78905078 is a deficient number, since it is larger than the sum of its proper divisors (56360794).

78905078 is a wasteful number, since it uses less digits than its factorization.

78905078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5636086.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 78905078 is about 8882.8530326692. The cubic root of 78905078 is about 428.9121193306.

The spelling of 78905078 in words is "seventy-eight million, nine hundred five thousand, seventy-eight".