78874890 has 48 divisors (see below), whose sum is σ = 199814688. Its totient is φ = 19923552.

The previous prime is 78874853. The next prime is 78874897. The reversal of 78874890 is 9847887.

It is not an unprimeable number, because it can be changed into a prime (78874897) 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 23 ways as a sum of consecutive naturals, for example, 7189 + ... + 14471.

It is an arithmetic number, because the mean of its divisors is an integer number (4162806).

Almost surely, 2^78874890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78874890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99907344).

78874890 is an abundant number, since it is smaller than the sum of its proper divisors (120939798).

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

78874890 is a wasteful number, since it uses less digits than its factorization.

78874890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7331 (or 7312 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 78874890 is about 8881.1536412788. The cubic root of 78874890 is about 428.8574137232.

The spelling of 78874890 in words is "seventy-eight million, eight hundred seventy-four thousand, eight hundred ninety".