90181010 has 16 divisors (see below), whose sum is σ = 167923800. Its totient is φ = 34828416.

The previous prime is 90181009. The next prime is 90181027. The reversal of 90181010 is 1018109.

It can be written as a sum of positive squares in 4 ways, for example, as 76335169 + 13845841 = 8737^2 + 3721^2 .

It is a super-2 number, since 2×90181010² = 16265229129240200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155195 + ... + 155774.

Almost surely, 2^90181010 is an apocalyptic number.

90181010 is a deficient number, since it is larger than the sum of its proper divisors (77742790).

90181010 is a wasteful number, since it uses less digits than its factorization.

90181010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311005.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 90181010 is about 9496.3682531797. The cubic root of 90181010 is about 448.4407101592.

Adding to 90181010 its reverse (1018109), we get a palindrome (91199119).

The spelling of 90181010 in words is "ninety million, one hundred eighty-one thousand, ten".