90309668 has 12 divisors (see below), whose sum is σ = 161024220. Its totient is φ = 44302752.

The previous prime is 90309631. The next prime is 90309731. The reversal of 90309668 is 86690309.

It can be written as a sum of positive squares in 2 ways, for example, as 21883684 + 68425984 = 4678^2 + 8272^2 .

It is a super-2 number, since 2×90309668² = 16311672268540448, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212783 + ... + 213206.

It is an arithmetic number, because the mean of its divisors is an integer number (13418685).

Almost surely, 2^90309668 is an apocalyptic number.

It is an amenable number.

90309668 is a deficient number, since it is larger than the sum of its proper divisors (70714552).

90309668 is a wasteful number, since it uses less digits than its factorization.

90309668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426046 (or 426044 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 90309668 is about 9503.1399021587. The cubic root of 90309668 is about 448.6538668954.

The spelling of 90309668 in words is "ninety million, three hundred nine thousand, six hundred sixty-eight".