90270640 has 20 divisors (see below), whose sum is σ = 209879424. Its totient is φ = 36108224.

The previous prime is 90270637. The next prime is 90270679. The reversal of 90270640 is 4607209.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 90270599 and 90270608.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 564112 + ... + 564271.

Almost surely, 2^90270640 is an apocalyptic number.

It is an amenable number.

90270640 is an abundant number, since it is smaller than the sum of its proper divisors (119608784).

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

90270640 is a wasteful number, since it uses less digits than its factorization.

90270640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128396 (or 1128390 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 90270640 is about 9501.0862536870. The cubic root of 90270640 is about 448.5892278725.

Adding to 90270640 its reverse (4607209), we get a palindrome (94877849).

The spelling of 90270640 in words is "ninety million, two hundred seventy thousand, six hundred forty".