990687455 has 16 divisors (see below), whose sum is σ = 1256294880. Its totient is φ = 747896832.

The previous prime is 990687443. The next prime is 990687463. The reversal of 990687455 is 554786099.

It is a cyclic number.

It is not a de Polignac number, because 990687455 - 2¹² = 990683359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 990687397 and 990687406.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4127 + ... + 44703.

It is an arithmetic number, because the mean of its divisors is an integer number (78518430).

Almost surely, 2^990687455 is an apocalyptic number.

990687455 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

990687455 is a deficient number, since it is larger than the sum of its proper divisors (265607425).

990687455 is a wasteful number, since it uses less digits than its factorization.

990687455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40858.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The square root of 990687455 is about 31475.1879263651. The cubic root of 990687455 is about 996.8861322250.

The spelling of 990687455 in words is "nine hundred ninety million, six hundred eighty-seven thousand, four hundred fifty-five".