90642018 has 16 divisors (see below), whose sum is σ = 182398176. Its totient is φ = 30028320.

The previous prime is 90641981. The next prime is 90642049. The reversal of 90642018 is 81024609.

It is a super-2 number, since 2×90642018² = 16431950854224648, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 45363 + ... + 47318.

It is an arithmetic number, because the mean of its divisors is an integer number (11399886).

Almost surely, 2^90642018 is an apocalyptic number.

90642018 is an abundant number, since it is smaller than the sum of its proper divisors (91756158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90642018 is a wasteful number, since it uses less digits than its factorization.

90642018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92849.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 90642018 is about 9520.6101695217. The cubic root of 90642018 is about 449.2035591372.

It can be divided in two parts, 906 and 42018, that added together give a palindrome (42924).

The spelling of 90642018 in words is "ninety million, six hundred forty-two thousand, eighteen".