90442647 has 18 divisors (see below), whose sum is σ = 136525896. Its totient is φ = 57586320.

The previous prime is 90442643. The next prime is 90442657. The reversal of 90442647 is 74624409.

90442647 is a `hidden beast` number, since 9 + 0 + 4 + 4 + 2 + 647 = 666.

It is not a de Polignac number, because 90442647 - 2² = 90442643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90442643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 136497 + ... + 137157.

It is an arithmetic number, because the mean of its divisors is an integer number (7584772).

Almost surely, 2^90442647 is an apocalyptic number.

90442647 is a deficient number, since it is larger than the sum of its proper divisors (46083249).

90442647 is an equidigital number, since it uses as much as digits as its factorization.

90442647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 90442647 is about 9510.1339107291. The cubic root of 90442647 is about 448.8739698824.

The spelling of 90442647 in words is "ninety million, four hundred forty-two thousand, six hundred forty-seven".