90181002 has 16 divisors (see below), whose sum is σ = 181444032. Its totient is φ = 29880000.

The previous prime is 90181001. The next prime is 90181009. The reversal of 90181002 is 20018109.

It is a super-2 number, since 2×90181002² = 16265226243448008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90181002.

It is not an unprimeable number, because it can be changed into a prime (90181001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43999 + ... + 46002.

It is an arithmetic number, because the mean of its divisors is an integer number (11340252).

Almost surely, 2^90181002 is an apocalyptic number.

90181002 is an abundant number, since it is smaller than the sum of its proper divisors (91263030).

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

90181002 is a wasteful number, since it uses less digits than its factorization.

90181002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90173.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 90181002 is about 9496.3678319661. The cubic root of 90181002 is about 448.4406968988.

It can be divided in two parts, 9018 and 1002, that multiplied together give a square (9036036 = 3006²).

The spelling of 90181002 in words is "ninety million, one hundred eighty-one thousand, two".