90681770 has 8 divisors (see below), whose sum is σ = 163227204. Its totient is φ = 36272704.

The previous prime is 90681769. The next prime is 90681779. The reversal of 90681770 is 7718609.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75463969 + 15217801 = 8687^2 + 3901^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (90681779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4534079 + ... + 4534098.

Almost surely, 2^90681770 is an apocalyptic number.

90681770 is a deficient number, since it is larger than the sum of its proper divisors (72545434).

90681770 is a wasteful number, since it uses less digits than its factorization.

90681770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9068184.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 90681770 is about 9522.6976219977. The cubic root of 90681770 is about 449.2692171712.

The spelling of 90681770 in words is "ninety million, six hundred eighty-one thousand, seven hundred seventy".