990190655 has 16 divisors (see below), whose sum is σ = 1207720800. Its totient is φ = 779192832.

The previous prime is 990190639. The next prime is 990190667. The reversal of 990190655 is 556091099.

It is a cyclic number.

It is not a de Polignac number, because 990190655 - 2⁴ = 990190639 is a prime.

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, 285371 + ... + 288819.

It is an arithmetic number, because the mean of its divisors is an integer number (75482550).

Almost surely, 2^990190655 is an apocalyptic number.

990190655 is a deficient number, since it is larger than the sum of its proper divisors (217530145).

990190655 is a wasteful number, since it uses less digits than its factorization.

990190655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4378.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 990190655 is about 31467.2950060853. The cubic root of 990190655 is about 996.7194682128.

The spelling of 990190655 in words is "nine hundred ninety million, one hundred ninety thousand, six hundred fifty-five".