99990655 has 16 divisors (see below), whose sum is σ = 125570304. Its totient is φ = 76343040.

The previous prime is 99990647. The next prime is 99990679. The reversal of 99990655 is 55609999.

It is not a de Polignac number, because 99990655 - 2³ = 99990647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6897 + ... + 15733.

It is an arithmetic number, because the mean of its divisors is an integer number (7848144).

Almost surely, 2^99990655 is an apocalyptic number.

99990655 is a deficient number, since it is larger than the sum of its proper divisors (25579649).

99990655 is a wasteful number, since it uses less digits than its factorization.

99990655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8946.

The product of its (nonzero) digits is 984150, while the sum is 52.

The square root of 99990655 is about 9999.5327390834. The cubic root of 99990655 is about 464.1444243617.

The spelling of 99990655 in words is "ninety-nine million, nine hundred ninety thousand, six hundred fifty-five".