9878890 has 24 divisors (see below), whose sum is σ = 20686212. Its totient is φ = 3386880.

The previous prime is 9878867. The next prime is 9878893. The reversal of 9878890 is 988789.

It can be written as a sum of positive squares in 2 ways, for example, as 9878449 + 441 = 3143^2 + 21^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (9878893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9591 + ... + 10570.

Almost surely, 2^9878890 is an apocalyptic number.

9878890 is an abundant number, since it is smaller than the sum of its proper divisors (10807322).

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

9878890 is a wasteful number, since it uses less digits than its factorization.

9878890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20182 (or 20175 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 9878890 is about 3143.0701551190. The cubic root of 9878890 is about 214.5701887404.

The spelling of 9878890 in words is "nine million, eight hundred seventy-eight thousand, eight hundred ninety".