90315640 has 32 divisors (see below), whose sum is σ = 203525280. Its totient is φ = 36070272.

The previous prime is 90315601. The next prime is 90315647. The reversal of 90315640 is 4651309.

It is a junction number, because it is equal to n+sod(n) for n = 90315599 and 90315608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90315647) 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 7 ways as a sum of consecutive naturals, for example, 32797 + ... + 35443.

It is an arithmetic number, because the mean of its divisors is an integer number (6360165).

Almost surely, 2^90315640 is an apocalyptic number.

It is an amenable number.

90315640 is an abundant number, since it is smaller than the sum of its proper divisors (113209640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90315640 is a wasteful number, since it uses less digits than its factorization.

90315640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511 (or 3507 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 90315640 is about 9503.4541089017. The cubic root of 90315640 is about 448.6637562088.

Adding to 90315640 its reverse (4651309), we get a palindrome (94966949).

The spelling of 90315640 in words is "ninety million, three hundred fifteen thousand, six hundred forty".