78284691 has 8 divisors (see below), whose sum is σ = 115977360. Its totient is φ = 52189776.

The previous prime is 78284669. The next prime is 78284699. The reversal of 78284691 is 19648287.

It is not a de Polignac number, because 78284691 - 2⁶ = 78284627 is a prime.

It is a super-2 number, since 2×78284691² = 12256985689930962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78284699) 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 7 ways as a sum of consecutive naturals, for example, 1449690 + ... + 1449743.

It is an arithmetic number, because the mean of its divisors is an integer number (14497170).

Almost surely, 2^78284691 is an apocalyptic number.

78284691 is a deficient number, since it is larger than the sum of its proper divisors (37692669).

78284691 is a wasteful number, since it uses less digits than its factorization.

78284691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899442 (or 2899436 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 78284691 is about 8847.8636404502. The cubic root of 78284691 is about 427.7850607232.

The spelling of 78284691 in words is "seventy-eight million, two hundred eighty-four thousand, six hundred ninety-one".