90018002 has 4 divisors (see below), whose sum is σ = 135027006. Its totient is φ = 45009000.

The previous prime is 90017987. The next prime is 90018007. The reversal of 90018002 is 20081009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20081009 = 13 ⋅1544693.

It can be written as a sum of positive squares in only one way, i.e., 60543961 + 29474041 = 7781^2 + 5429^2 .

It is not an unprimeable number, because it can be changed into a prime (90018007) 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 as a sum of consecutive naturals, namely, 22504499 + ... + 22504502.

Almost surely, 2^90018002 is an apocalyptic number.

90018002 is a deficient number, since it is larger than the sum of its proper divisors (45009004).

90018002 is a wasteful number, since it uses less digits than its factorization.

90018002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45009003.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 90018002 is about 9487.7817217725. The cubic root of 90018002 is about 448.1703520150.

The spelling of 90018002 in words is "ninety million, eighteen thousand, two".