78281855 has 8 divisors (see below), whose sum is σ = 99464112. Its totient is φ = 58941568.

The previous prime is 78281807. The next prime is 78281869. The reversal of 78281855 is 55818287.

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

It is a cyclic number.

It is not a de Polignac number, because 78281855 - 2²⁰ = 77233279 is a prime.

It is a super-2 number, since 2×78281855² = 12256097644482050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460397 + ... + 460566.

It is an arithmetic number, because the mean of its divisors is an integer number (12433014).

Almost surely, 2^78281855 is an apocalyptic number.

78281855 is a deficient number, since it is larger than the sum of its proper divisors (21182257).

78281855 is a wasteful number, since it uses less digits than its factorization.

78281855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920985.

The product of its digits is 179200, while the sum is 44.

The square root of 78281855 is about 8847.7033743226. The cubic root of 78281855 is about 427.7798949065.

The spelling of 78281855 in words is "seventy-eight million, two hundred eighty-one thousand, eight hundred fifty-five".