99781688290 has 16 divisors (see below), whose sum is σ = 179631831168. Its totient is φ = 39907165936.

The previous prime is 99781688093. The next prime is 99781688299. The reversal of 99781688290 is 9288618799.

It is not an unprimeable number, because it can be changed into a prime (99781688299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612202 + ... + 757861.

It is an arithmetic number, because the mean of its divisors is an integer number (11226989448).

Almost surely, 2^99781688290 is an apocalyptic number.

99781688290 is a deficient number, since it is larger than the sum of its proper divisors (79850142878).

99781688290 is a wasteful number, since it uses less digits than its factorization.

99781688290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377353.

The product of its (nonzero) digits is 31352832, while the sum is 67.

The spelling of 99781688290 in words is "ninety-nine billion, seven hundred eighty-one million, six hundred eighty-eight thousand, two hundred ninety".