8742978 has 40 divisors (see below), whose sum is σ = 20277180. Its totient is φ = 2812320.

The previous prime is 8742977. The next prime is 8742997. The reversal of 8742978 is 8792478.

It can be written as a sum of positive squares in 2 ways, for example, as 7634169 + 1108809 = 2763^2 + 1053^2 .

It is not an unprimeable number, because it can be changed into a prime (8742973) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3768 + ... + 5628.

Almost surely, 2^8742978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8742978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10138590).

8742978 is an abundant number, since it is smaller than the sum of its proper divisors (11534202).

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

8742978 is a wasteful number, since it uses less digits than its factorization.

8742978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904 (or 1895 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 8742978 is about 2956.8527186859. The cubic root of 8742978 is about 206.0091270660.

The spelling of 8742978 in words is "eight million, seven hundred forty-two thousand, nine hundred seventy-eight".