99780489 has 12 divisors (see below), whose sum is σ = 146158272. Its totient is φ = 65583000.

The previous prime is 99780451. The next prime is 99780491. The reversal of 99780489 is 98408799.

99780489 is a `hidden beast` number, since 99 + 78 + 0 + 489 = 666.

It is not a de Polignac number, because 99780489 - 2¹² = 99776393 is a prime.

It is a super-2 number, since 2×99780489² = 19912291970158242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99780449) 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, 77437 + ... + 78714.

It is an arithmetic number, because the mean of its divisors is an integer number (12179856).

Almost surely, 2^99780489 is an apocalyptic number.

It is an amenable number.

99780489 is a deficient number, since it is larger than the sum of its proper divisors (46377783).

99780489 is a wasteful number, since it uses less digits than its factorization.

99780489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156228 (or 156225 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 99780489 is about 9989.0184202453. The cubic root of 99780489 is about 463.8190079497.

The spelling of 99780489 in words is "ninety-nine million, seven hundred eighty thousand, four hundred eighty-nine".