78007780 has 48 divisors (see below), whose sum is σ = 172763136. Its totient is φ = 29543040.

The previous prime is 78007759. The next prime is 78007793. The reversal of 78007780 is 8770087.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 27802 + ... + 30478.

It is an arithmetic number, because the mean of its divisors is an integer number (3599232).

Almost surely, 2^78007780 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 78007780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86381568).

78007780 is an abundant number, since it is smaller than the sum of its proper divisors (94755356).

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

78007780 is a wasteful number, since it uses less digits than its factorization.

78007780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2764 (or 2762 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 37.

The square root of 78007780 is about 8832.2013111115. The cubic root of 78007780 is about 427.2800733747.

It can be divided in two parts, 78007 and 780, that added together give a palindrome (78787).

The spelling of 78007780 in words is "seventy-eight million, seven thousand, seven hundred eighty".