90621730 has 24 divisors (see below), whose sum is σ = 173284308. Its totient is φ = 34115328.

The previous prime is 90621719. The next prime is 90621731. The reversal of 90621730 is 3712609.

It can be written as a sum of positive squares in 6 ways, for example, as 74805201 + 15816529 = 8649^2 + 3977^2 .

It is not an unprimeable number, because it can be changed into a prime (90621731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12789 + ... + 18568.

Almost surely, 2^90621730 is an apocalyptic number.

90621730 is a deficient number, since it is larger than the sum of its proper divisors (82662578).

90621730 is a wasteful number, since it uses less digits than its factorization.

90621730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31398 (or 31381 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 90621730 is about 9519.5446319664. The cubic root of 90621730 is about 449.1700422244.

The spelling of 90621730 in words is "ninety million, six hundred twenty-one thousand, seven hundred thirty".