77878836 has 180 divisors, whose sum is σ = 247754052. Its totient is φ = 20547072.

The previous prime is 77878831. The next prime is 77878877. The reversal of 77878836 is 63887877.

It can be written as a sum of positive squares in 2 ways, for example, as 58430736 + 19448100 = 7644^2 + 4410^2 .

It is a super-2 number, since 2×77878836² = 12130226193429792, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77878831) 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 59 ways as a sum of consecutive naturals, for example, 1469386 + ... + 1469438.

Almost surely, 2^77878836 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 77878836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123877026).

77878836 is an abundant number, since it is smaller than the sum of its proper divisors (169875216).

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

77878836 is a wasteful number, since it uses less digits than its factorization.

77878836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 82 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 77878836 is about 8824.8986396445. The cubic root of 77878836 is about 427.0445174405.

The spelling of 77878836 in words is "seventy-seven million, eight hundred seventy-eight thousand, eight hundred thirty-six".