78291808 has 60 divisors (see below), whose sum is σ = 179992260. Its totient is φ = 33520704.

The previous prime is 78291803. The next prime is 78291841. The reversal of 78291808 is 80819287.

It is a super-2 number, since 2×78291808² = 12259214399817728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78291803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 76323 + ... + 77341.

It is an arithmetic number, because the mean of its divisors is an integer number (2999871).

Almost surely, 2^78291808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78291808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89996130).

78291808 is an abundant number, since it is smaller than the sum of its proper divisors (101700452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78291808 is an equidigital number, since it uses as much as digits as its factorization.

78291808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057 (or 1028 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 78291808 is about 8848.2658187918. The cubic root of 78291808 is about 427.7980238964.

The spelling of 78291808 in words is "seventy-eight million, two hundred ninety-one thousand, eight hundred eight".