78700776 has 128 divisors (see below), whose sum is σ = 252149760. Its totient is φ = 19872000.

The previous prime is 78700763. The next prime is 78700777. The reversal of 78700776 is 67700787.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (78700777) 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 31 ways as a sum of consecutive naturals, for example, 67801 + ... + 68951.

It is an arithmetic number, because the mean of its divisors is an integer number (1969920).

Almost surely, 2^78700776 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 78700776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126074880).

78700776 is an abundant number, since it is smaller than the sum of its proper divisors (173448984).

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

78700776 is a wasteful number, since it uses less digits than its factorization.

78700776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 115248, while the sum is 42.

The square root of 78700776 is about 8871.3457829125. The cubic root of 78700776 is about 428.5416178630.

The spelling of 78700776 in words is "seventy-eight million, seven hundred thousand, seven hundred seventy-six".