990706658 has 4 divisors (see below), whose sum is σ = 1486059990. Its totient is φ = 495353328.

The previous prime is 990706643. The next prime is 990706697. The reversal of 990706658 is 856607099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 856607099 = 139 ⋅6162641.

It can be written as a sum of positive squares in only one way, i.e., 833881129 + 156825529 = 28877^2 + 12523^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247676663 + ... + 247676666.

Almost surely, 2^990706658 is an apocalyptic number.

990706658 is a deficient number, since it is larger than the sum of its proper divisors (495353332).

990706658 is a wasteful number, since it uses less digits than its factorization.

990706658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495353331.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 990706658 is about 31475.4929746938. The cubic root of 990706658 is about 996.8925732341.

The spelling of 990706658 in words is "nine hundred ninety million, seven hundred six thousand, six hundred fifty-eight".