90661210 has 12 divisors (see below), whose sum is σ = 163244394. Its totient is φ = 36252440.

The previous prime is 90661199. The next prime is 90661213. The reversal of 90661210 is 1216609.

It can be written as a sum of positive squares in only one way, i.e., 81595089 + 9066121 = 9033^2 + 3011^2 .

It is not an unprimeable number, because it can be changed into a prime (90661213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28605 + ... + 31615.

Almost surely, 2^90661210 is an apocalyptic number.

90661210 is a deficient number, since it is larger than the sum of its proper divisors (72583184).

90661210 is an frugal number, since it uses more digits than its factorization.

90661210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6029 (or 3018 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 90661210 is about 9521.6180347670. The cubic root of 90661210 is about 449.2352607935.

Adding to 90661210 its reverse (1216609), we get a palindrome (91877819).

The spelling of 90661210 in words is "ninety million, six hundred sixty-one thousand, two hundred ten".