990077691 has 8 divisors (see below), whose sum is σ = 1336814080. Its totient is φ = 651696552.

The previous prime is 990077681. The next prime is 990077713. The reversal of 990077691 is 196770099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990077691 - 2¹¹ = 990075643 is a prime.

It is the 31466-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990077691.

It is not an unprimeable number, because it can be changed into a prime (990077681) by changing a digit.

It is a nontrivial repunit in base 31465.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2088535 + ... + 2089008.

It is an arithmetic number, because the mean of its divisors is an integer number (167101760).

Almost surely, 2^990077691 is an apocalyptic number.

990077691 is a deficient number, since it is larger than the sum of its proper divisors (346736389).

990077691 is a wasteful number, since it uses less digits than its factorization.

990077691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177625.

The product of its (nonzero) digits is 214326, while the sum is 48.

The square root of 990077691 is about 31465.5000119178. The cubic root of 990077691 is about 996.6815638289.

The spelling of 990077691 in words is "nine hundred ninety million, seventy-seven thousand, six hundred ninety-one".