9890820 has 36 divisors (see below), whose sum is σ = 30002700. Its totient is φ = 2637504.

The previous prime is 9890813. The next prime is 9890833. The reversal of 9890820 is 280989.

It can be written as a sum of positive squares in 2 ways, for example, as 3326976 + 6563844 = 1824^2 + 2562^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27295 + ... + 27654.

Almost surely, 2^9890820 is an apocalyptic number.

9890820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9890820 is an abundant number, since it is smaller than the sum of its proper divisors (20111880).

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

9890820 is a wasteful number, since it uses less digits than its factorization.

9890820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54964 (or 54959 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 9890820 is about 3144.9674084162. The cubic root of 9890820 is about 214.6565274757.

The spelling of 9890820 in words is "nine million, eight hundred ninety thousand, eight hundred twenty".